crop-chem-docs/corpus/epa_ppls/5481-686.md

# ZALO HERBICIDE

- EPA Reg No: **5481-686**
- Registrant: AMVAC CHEMICAL CORPORATION
- Signal word: Danger
- Active ingredients: Quizalofop-p-ethyl (2.4%); Glufosinate (24.6%)
- Label accepted: 2024-02-13
- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/005481-00686-20240213.pdf

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1 
 
 
 
 
U.S. ENVIRONMENTAL PROTECTION AGENCY 
Office of Pesticide Programs 
Registration Division (7505T) 
1200 Pennsylvania Ave., N.W. 
Washington, D.C. 20460 
 
EPA Reg. Number: 
 
5481-686 
 
Date of Issuance: 
 
2/13/24 
NOTICE OF PESTICIDE: 
 X Registration 
 Reregistration 
 
Term of Issuance: 
Unconditional 
 (under FIFRA, as amended) 
Name of Pesticide Product: 
Zalo Herbicide 
 
Name and Address of Registrant (include ZIP Code): 
AMVAC Chemical Corporation 
4695 MacArthur Court, Suite #1200 
Newport Beach, CA 92660 
 
Note: Changes in labeling differing in substance from that accepted in connection with this registration must be submitted to and accepted by the 
Registration Division prior to use of the label in commerce. In any correspondence on this product always refer to the above EPA registration number. 
 
On the basis of information furnished by the registrant, the above named pesticide is hereby registered 
under the Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA). 
 
Registration is in no way to be construed as an endorsement or recommendation of this product by the 
Agency. In order to protect health and the environment, the Administrator, on his motion, may at any 
time suspend or cancel the registration of a pesticide in accordance with the Act. The acceptance of 
any name in connection with the registration of a product under this Act is not to be construed as 
giving the registrant a right to exclusive use of the name or to its use if it has been covered by others. 
 
This product is unconditionally registered in accordance with FIFRA section 3(c)(5) provided that you: 
 
1. Submit and/or cite all data required for registration/reregistration/registration review of your 
product when the Agency requires all registrants of similar products to submit such data. 
 
2. The data requirements for storage stability and corrosion characteristics (Guidelines 830.6317 
and 830.6320) are not satisfied. You have 18 months from the date of registration to provide 
these data. 
Continues page 2 
 
Signature of Approving Official: 
 
Lydia Crawford, Acting Product Manager 24 
Fungicide & Herbicide Branch, Registration Division (7505T) 
 
Date: 
 
 
 2/13/24

Page 2 of 2 
EPA Reg. No. 5481-686 
Case No. 00474320 
 
EPA Form 8570-6 
3. Make the following label changes before you release the product for shipment: 
 
 Revise the EPA Registration Number to read, “EPA Reg. No. 5481-686.” 
 
4. Submit one copy of the final printed label for the record before you release the product for 
shipment. 
 
Should you wish to add/retain a reference to the company’s website on your label, then please be 
aware that the website becomes labeling under FIFRA and is subject to review by the Agency. If the 
website is false or misleading, the product would be misbranded and unlawful to sell or distribute 
under FIFRA section 12(a)(1)(E). 40 CFR 156.10(a)(5) lists examples of statements EPA may consider 
false or misleading. In addition, regardless of whether a website is referenced on your product’s label, 
claims made on the website may not substantially differ from those claims approved through the 
registration process. Therefore, should the Agency find or if it is brought to our attention that a 
website contains false or misleading statements or claims substantially differing from the EPA 
approved registration, the website will be referred to the EPA’s Office of Enforcement and Compliance. 
 
If these conditions are not complied with, the registration will be subject to cancellation in accordance 
with FIFRA section 6. Your release for shipment of the product constitutes acceptance of these 
conditions. A stamped copy of the label is enclosed for your records. 
 
The record for this product currently contains the following CSF(s): 
 
 Basic CSF dated 10/13/2022 
 
If you have any questions, please contact Francisco Llarena-Arias at 202-566-2816 or at llarena-
arias.francisco@epa.gov. 
 
Enclosure

Page 1 of 18 
 
 
ZALO HERBICIDE 
 
For nonselective control of emerged grass and broadleaf weeds in glufosinate-resistant canola, cotton and soybeans. 
For use on pome fruit (crop group 11-10) and stone fruit (crop group 12-12). 
 
Active Ingredients: 
Quizalofop-P-ethyl ................................................................................................................................................................ 2.4% 
Glufosinate-ammonium ...................................................................................................................................................... 24.6% 
Inert ingredients:................................................................................................................................................................. 73.0% 
Total: 100.00% 
 
1 gallon of ZALO HERBICIDE contains 0.23 pounds of QUIZALOFOP- P-ETHYL ester and 2.29 pounds of GLUFOSINATE -
AMMONIUM. 
This product is a soluble liquid formulation. 
Contains petroleum distillates. 
 
KEEP OUT OF REACH OF CHILDREN/MANTENER FUERA DEL ALCANCE DE LOS NIÑOS 
DANGER/PELIGRO 
 
Si usted no entiende la etiqueta, busque a alguien para que se la explique a usted en detalle. 
(If you do not understand this label, find someone to explain it to you in detail). 
 
FIRST AID 
If in eyes: 
• Hold eye open and rinse slowly and gently with water for 15 - 20 minutes. 
• Remove contact lenses, if present, after first 5 minutes, then continue rinsing eye. 
• Call a poison control center or doctor for treatment advice. 
If swallowed: 
• Call a poison control center or doctor immediately for treatment advice. 
• DO NOT give any liquid to the person. 
• DO NOT induce vomiting unless told to do so by a poison control center or doctor. 
• DO NOT give anything by mouth to an unconscious person. 
If on skin or clothing: 
• Take off contaminated clothing. 
• Rinse skin immediately with plenty of water for 15 - 20 minutes. 
• Call a poison control center or doctor for treatment advice. 
If inhaled: 
• Move person to fresh air. 
• If person is not breathing, call 911 or an ambulance, and then give artificial respiration, 
preferably mouth-to-mouth, if possible. 
• Call a poison control center or doctor for treatment advice. 
NOTE TO PHYSICIAN 
Probable mucosal damage may contraindicate the use of gastric lavage. 
Contains petroleum distillate. Vomiting may cause aspiration pneumonia. 
EMERGENCY INFORMATION 
Have the product container or label with you when calling a poison control center or doctor or going for treatment. 
FOR THE FOLLOWING EMERGENCIES, PHONE 24 HOURS A DAY: 
For Medical Emergencies phone:......................................................................................................................1 -888-681-4261 
For Transportation Emergencies, including spill, leak or fire, phone: CHEMTREC®………………………….…………...1 -800-424-9300 
For Product Use Information phone: AMVAC®……………………………………………………………..………....…….…...........1 -888-462-6822 
Quizalofop-P-ethyl Group 1 Herbicide 
Glufosinate-ammonium Group 10 Herbicide 
02/13/2024
5481-686

Page 2 of 18 
 
[See booklet for additional Precautionary Statements and Directions for Use. ] 
 
EPA Reg. No. 5481-xxx Net Contents: __________ 
EPA Est. No:________ 
 
 
 
 
[ Manufactured For] 
AMVAC Chemical Corporation 
4695 MacArthur Court, Suite 1200 
Newport Beach, CA 92660 U.S.A. 
1-888-462-6822 
[Made in _____] 
 
PRECAUTIONARY STATEMENTS 
Hazards to Humans and Domestic Animals 
DANGER/PELIGRO 
Corrosive. Causes irreversible eye damage. DO NOT get in eyes or on clothing. Wear protective eyewear. 
Wash thoroughly with soap and water after handling and before eating, drinking, chewing gum, using tobacco, or using the 
toilet. Remove and wash contaminated clothing before reuse. Prolonged or frequently repeated skin contact may cause 
allergic reactions in some individuals. 
 
Personal Protective Equipment (PPE) 
Mixers, Loaders, Applicators and other handlers must wear: 
• Protective eyewear (goggles, face shield or safety glasses) 
• Long-sleeved shirt and long pants 
• Chemical-resistant gloves made of barrier laminate or Viton
® ≥14 mils. 
• Shoes plus socks 
 
User Safety Requirements 
Discard clothing and other absorbent materials that have been drenched or heavily contaminated with this product. DO NOT 
reuse them. Follow manufacturer’s instructions for cleaning/maintaining PPE. If no such instructions for washables exist use 
detergent and hot water. Keep and wash PPE separately from other laundry. 
 
 
USER SAFETY RECOMMENDATIONS 
Users should: 
• Remove clothing/PPE immediately if pesticide gets inside. Then wash thoroughly and put on clean clothing. 
• Remove PPE immediately after handling this product. Wash the outside of gloves before removing. As soon as 
possible, wash thoroughly and change into clean clothing.

Page 3 of 18 
Engineering Controls Statement 
When handlers use closed systems, enclosed cabs, or aircraft in a manner that meets the requirements listed in the Worker 
Protection Standard (WPS) for agricultural pesticides [40 CFR 170.240(d)(4-6)], the handler PPE requirements may be reduced 
or modified as specified in the WPS. 
 
Mixer/loaders supporting aerial applications to canola, soybean, and cotton must use closed mixing/loading systems . 
 
Environmental Hazards 
DO NOT apply directly to water or to areas where surface water is present. D O NOT apply to intertidal areas below the mean 
high-water mark. DO NOT contaminate water by cleaning of equipment or disposal of equipment wash waters or rinsate. 
 
This product is moderately toxic to bees on a chronic basis, and may cause chronic risk to pollinators or other terrestrial 
invertebrates. DO NOT apply this product to blooming vegetation or if bees or other pollinating insects are visiting the 
treatment area. 
 
This product is toxic to plants and may adversely impact the forage and habitat of non- target organisms, including 
pollinators, in areas adjacent to the treated site. Protect the forage and habitat of non -target organisms by following label 
directions intended to minimize spray drift and runoff. 
 
This product is toxic to fish and invertebrates and must be used strictly in accordance with the drift and runoff precautions on 
this label in order to minimize off-site exposures. 
This product may contaminate water through drift of spray in wind. T his product may have a potential to runoff to surface 
water or adjacent land for several months or more after application. Where possible use methods which reduce soil erosion 
including no-till, limited till or contour plowing; these methods also reduce pesticide runoff. Poorly drained soils and soils 
with shallow water tables are more prone to produce runoff that contains this product. A level well maintained vegetative 
buffer strip between areas to which the product is applied and surface water features including along rivers, creeks, streams, 
wetlands, etc. or on the downhill side of fields where runoff could occur is recommended to minimize water runoff and will 
reduce the potential for contamination of water from rainfall -runoff. Runoff of this product will be reduced by avoiding 
applications when rainfall is forecasted to occur within 48 hours. Sound erosion practices will reduce this product's 
contribution to surface water contamination. 
 
DIRECTIONS FOR USE 
 
It is a violation of Federal law to use this product in a manner inconsistent with its labeling. 
 
DO NOT use this product until you have read the entire label. 
 
DO NOT apply this product in a way that will contact workers or other persons either directly or through drift. Only protected 
handlers may be in the area during application. Consult the agency responsible for pesticide regulation for any requirements 
specific to your State or Tribe. 
 
Refer to Crop Specific Use Directions Table 4 for crops excluded for use of ZALO H ERBICIDE in New York State and/or it’s 
counties.

Page 4 of 18 
Agricultural Use Requirements 
Use this product only in accordance with its labeling and with the Worker Protection Standard, 40 CFR part 170. This 
Standard contains requirements for the protection of agricultural workers on farms, forests, nurseries, and greenhouses, 
and handlers of ag ricultural pesticides. It contains requirements for training, decontamination, notification, and 
emergency assistance. It also contains specific instructions and exceptions pertaining to the statements on this label about 
personal protective equipment (PPE) and restricted-entry interval. The requirements in this box only apply to uses of this 
product that are covered by the Worker Protection Standard. 
 
DO NOT enter or allow worker entry into treated areas during the restricted en try interval (REI) of 12 hours , with the 
following exceptions: 
• Canola and soybean scouting- REI of 4 days. 
• DO NOT move irrigation pipe within 7 days of an application to any crop. 
 
PPE required for early entry to treated areas that is permitted under the Worker Protection Standard and that involves 
contact with anything that has been treated, including plants, soil, or water, is: 
• Protective eyewear (goggles, face shield or safety glasses) 
• Long-sleeved shirt and long pants 
• Chemical-resistant gloves made of barrier laminate or Viton
 ≥14 mils. 
• Shoes plus socks 
All applicable directions, restrictions, precautions and Limited Warranty and Disclaimer are to be followed. This labeling must 
be in the user’s possession during application. 
 
IMPORTANT CROP SAFETY INFORMATION 
READ BEFORE USING THIS PRODUCT 
Postemergence applications of ZALO HERBICIDE may be made only to canola, cotton, and soybean resis tant to the active 
ingredients in this product. To the extent consistent with applicable law AMVAC does not warrant the use of this product on 
canola, cotton, and soybean other than those designated as glufosinate-resistant to safely withstand the application of ZALO 
HERBICIDE. 
 
The basis of selectivity of ZALO HERBICIDE in broadleaf crops, including canola, cotton, and soybean is the presence of a gene 
which results in canola, cotton, and soybean plants resistant to glufosinate, one of the active ingredients in ZALO HERBICIDE. 
Crops not containing this gene conferring tolerance will not be resistant to ZALO HERBICIDE and severe crop injury and/or 
death may occur. DO NOT allow spray to contact foliage or green tissue of desirable vegetation other than crops resistant to 
the active ingredients in this product. 
 
Rate Conversion Table 
Rate of ZALO HERBICIDE 
(fl oz/A) 
Active Ingredient (lb ai/A) 
Quizalofop-P-ethyl Glufosinate-ammonium 
22 0.040 0.394 
29 0.052 0.519 
32 0.058 0.573 
43 0.077 0.769 
46 0.083 0.823 
58 0.104 1.037 
69 0.124 1.234 
92 0.165 1.646

Page 5 of 18 
I. PRODUCT INFORMATION 
ZALO HERBICIDE contains both a lipophilic, systemic herbicide (quizalofop-P-ethyl) and a water-soluble, nonselective, contact 
herbicide (glufosinate) that controls or suppresses emerged broadleaf and grass weeds in glufosinate-resistant canola, cotton, 
and soybean. 
 
ZALO HERBICIDE is absorbed by plant foliage and controls weeds by ACC- ase enzyme inhibition (Group 1) and glutamine 
biosynthesis inhibition (Group 10). ZALO HERBICIDE is foliar active with no residual soil activity. Weeds that emerge after 
application will not be controlled. Apply to small, actively growing weeds before weeds exceed the maximum stem height or 
vine length listed for broadleaf weeds listed in Table 1 and grass weeds listed in Table 2. 
 
ZALO HERBICIDE requires uniform thorough spray coverage. Applications made in warm temperatures, high humidity, bright 
sunlight between dawn and 2 hours before sunset will provide optimum activity. Weed control may be reduced if application 
is made when heavy dew and mist/rain are present; or when weeds are under stress due to environmental conditions 
including drought, extreme heat, cold temperatures, or extended periods of cloudiness. Small grass and broadleaf plants may 
be completely desiccated within 2 to 4 days after application under good growing conditions. Large grass and broadleaf plants 
may not be completely desiccated and may resume growth after application. Total herbicidal activity on broadleaf weeds will 
be less than 7 days after application but may take up to 14 days after application for grass weeds. 
 
Susceptible Non-target Plants 
DO NOT apply under circumstances where spray drift may occur to food, forage, or other plantings that might be damaged 
or crops thereof rendered unfit for sale, use or consumption. D O NOT allow contact of herbicide with foliage, green stems, 
exposed non-woody roots of crops, desirable plants; including trees, because severe injury or destruction may result. Small 
amounts of spray drift that may not be visible may injure susceptible plants. Most grass crops, when not resistant to 
quizalofop-P-ethyl, such as wheat, barley, rye, oat, sorghum, rice, and corn are highly susceptible to ZALO HERBICIDE. Before 
making an application, please refer to your state’s susceptible crop registry (if available) to identify any commercial specialty 
or certified organic crops that may be located nearby. 
 
Rainfall or overhead irrigation within 4 hours after application may result in reduced weed contro l. 
 
Table 1. Emerged Broadleaf Weed Control (C) or Partial Control (PC) with ZALO HERBICIDE and Maximum Weed Size at 
Application (Including ALS, Auxin-, Glyphosate-, HPPD-, PPO- and Triazine-Resistant Biotypes) 
 
Broadleaf Weeds 22 fl oz/A Product 32 fl oz/A Product 43 fl oz/A Product 
Up to 3 inches tall Up to 3 inches tall Up to 3 inches tall 
Amaranth, Palmer1 Amaranthus palmeri PC C C 
Amaranth, Powell Amaranthus powellii C C C 
Anoda, spurred Anoda cristata C C C 
Bedstraw, catchweed (cleavers) Galium aparine C C C 
Beggarweed, Florida Desmodium tortuosum C C C 
Blueweed, Texas Helianthus ciliaris C C C 
Buckwheat, wild Fallopia convolvulus C C C 
Buffalobur Solanum rostratum C C C 
Burcucumber Sicyos angulatus C C C 
Canola, volunteer2 Brassica sp. C C C 
Carpetweed Mollugo verticillata C C C 
Chickweed, common Stellaria media C C C 
Cocklebur, common Xanthium strumarium C C C 
Copperleaf, hophornbeam Acalypha ostryifolia C C C 
Cotton, volunteer2 Gossypium spp. C C C 
Croton, tropic Croton glandulosus C C C 
Croton, woolly Croton capitatus C C C 
Devil’s-claw Proboscidea louisianica C C C 
Eclipta Eclipta alba C C C 
Fleabane, annual Erigeron annuus C C C

Page 6 of 18 
Galinsoga, hairy Galinsoga ciliata C C C 
Galinsoga, small flower Galinsoga parviflora C C C 
Geranium, cutleaf Geranium dissectum C C C 
Groundcherry, cutleaf Physalis angulata C C C 
Hempnettle Galeopsis spp. C C C 
Horsenettle, Carolina3 Solanum carolinense C C C 
Jimsonweed Datura stramonium C C C 
Knotweed Polygonum spp. C C C 
Kochia Kochia scoparia C C C 
Ladysthumb Polygonum persicaria C C C 
Lambsquarters, common Chenopodium album C C C 
Mallow, common Malva spp. C C C 
Mallow, Venice Hibiscus trionum C C C 
Marestail4 (horseweed) Erigeron canadensis PC C C 
Marshelder, annual Iva annua C C C 
Medic, black Medicago lupulina C C C 
Morningglory, annual Ipomoea spp. C C C 
Mustard, wild Sinapis arvensis C C C 
Nightshade (annual) Solanum spp. C C C 
Pennycress, Field (Stinkweed) Thlaspi arvense C C C 
Pigweed, prostrate Amaranthus blitoides C C C 
Pigweed, redroot Amaranthus retroflexus C C C 
Pigweed, smooth Amaranthus hybridus C C C 
Pigweed, spiny Amaranthus spinosus C C C 
Pigweed, tumble Amaranthus album C C C 
Puncturevine Tribulus terrestris C C C 
Purslane, common Portulaca oleracea C C C 
Pusley, Florida Richardia scabra C C C 
Ragweed, common Ambrosia artemisiifolia C C C 
Ragweed, giant Ambrosia trifida C C C 
Senna, coffee Senna occidentalis C C C 
Sesbania, hemp Sesbania herbacea C C C 
Shepherd’s purse Capsella bursa-pastoris C C C 
Sicklepod (java bean) Senna obtusifolia C C C 
Sida, prickly (teaweed) Sida spinosa C C C 
Smartweed, Pennsylvania Polygonum pensylvanicum C C C 
Smellmelon Cucumis melo C C C 
Sowthistle, annual Sonchus oleraceus C C C 
Soybean, volunteer2 Glycine max PC C C 
Spurge, prostrate Euphorbia prostrata C C C 
Spurge, spotted Euphorbia maculata C C C 
Starbur, bristly Acanthospermum hispidum C C C 
Sunflower (annual) Helianthus spp. C C C 
Thistle, Russian3 Salsola iberica C C C 
Velvetleaf Abutilon theophrasti C C C 
Waterhemp, common1 Amaranthus rudis PC C C 
Waterhemp, tall1 Amaranthus tuberculatus PC C C 
 
1 Will not control glufosinate resistant weed biotypes. 
2 Will not control volunteer glufosinate-resistant (LibertyLink®) crops from the previous season. 
3 Requires sequential application for control but DO NOT exceed restrictions in Table 4. 
4 Apply ZALO HERBICIDE on 6-inch or smaller marestail for optimum control.

Page 7 of 18 
Table 2. Emerged Grass Weed Control (C) or Partially Control (PC) with ZALO HERBICIDE and Maximum Weed Size at Application 
(Including ACC-ase Resistant Biotypes) 
 
Grass Weeds1 22 fl oz/A Product 32 fl oz/A Product 43 fl oz/A Product 
≤ 10 inches tall ≤ 20 inches in tall ≤ 30 inches tall 
Corn, volunteer2 Zea mays C C C 
Johnsongrass, Rhizome Sorghum halepense PC PC C 
Sorghum, volunteer2 Sorghum bicolor C C C 
 ≤ 6 inches tall ≤ 10 inches tall ≤ 12 inches tall 
Quackgrass Agropyron repens PC PC C 
Shattercane Sorghum bicolor C C C 
 ≤ 3 inches tall ≤ 4 inches tall ≤ 5 inches tall 
Barley, volunteer Hordeum vulgare PC C C 
Barnyardgrass3 Echinochloa crus-galli C C C 
Bermudagrass3 Cynodon dactylon PC PC PC 
Bluegrass, annual Poa annua C C C 
Brome, downy Bromus tectorum PC PC C 
Crabgrass, large3 Digitaria sanguinalis C C C 
Crabgrass, smooth3 Digitaria ischaemum C C C 
Crowfootgrass Dactyloctenium aegyptium PC C C 
Cupgrass, woolly3 Eriochloa villosa C C PC 
Foxtail, bristly Setaria verticillata C C C 
Foxtail, giant Setaria faberi C C C 
Foxtail, green Setaria viridis C C C 
Foxtail, robust purple Seteria viridis C C C 
Foxtail, yellow3 Setaria pumila C C PC 
Goatgrass, jointed Aegilops cylindrica PC PC C 
Goosegrass Eleusine indica C C C 
Itchgrass Rottboellia exaltata PC C C 
Johnsongrass, seedling Sorghum halepense C C C 
Junglerice Echinochloa colonum C C C 
Millet, volunteer/wild proso Panicum miliaceum C C C 
Oat, volunteer Avena sativa PC C C 
Oat, wild2 Avena fatua C C C 
Panicum, fall Panicum dichotomiflorum C C C 
Panicum, Texas3 Panicum texanum C C C 
Rice, red3 Oryza sativa C C C 
Rye, volunteer Secale cereale PC C C 
Ryegrass, Italian2 Lolium multiflorum PC PC C 
Sandbur, field Cenchrus incertus PC C C 
Signalgrass, broadleaf Brachiaria platyphylla C C C 
Sprangletop Leptochloa filiformis C C C 
Stinkgrass Eragrostis cilianensis C C C 
Wheat, volunteer Triticum aestivum C C C 
Windgrass Bromus mollis PC PC C 
Wirestem muhly Muhlenbergia frondosa PC C C 
Witchgrass Panicum capillare C C C 
 
1 Greatest control when applied to small, actively growing weeds. Drought at and immediately following application will significant ly 
decrease ZALO HERBICIDE activity. Applying the maximum rate may not kill stressed weeds. Tank mixing with certain broadleaf herbicides 
may result in reduced grass control (see Section V. Tank Mix Information). To prevent reduced grass control, apply ZALO HERBICIDE either 
1 day before or 7 days after certain broadleaf herbicides. DO NOT exceed restrictions in Table 4. 
2 Quizalofop-P-ethyl does not control Group 1 (ACC-ase) resistant grass biotypes or glufosinate- and quizalofop-P-ethyl- resistant 
volunteer corn. 
3 Apply before tiller initiation of grasses. Apply the maximum rate listed. Sequential applications may increase control. Allow a minimum 
of 7 days after the first application. DO NOT exceed restrictions in Table 4.

Page 8 of 18 
 
 
Weed Resistance Management 
Herbicide resistance has become an important management focus to maximize weed control. Weeds have developed 
resistance to many herbicide modes of action. ZALO HERBICIDE contains both a Group 1 (quizalofop-P-ethyl) and a Group 10 
(glufosinate-ammonium) herbicide to reduce selection of herbicide resistance in weeds. Any weed population may contain 
plants resistant to Group 1 and/or Group 10 herbicides. Resistant plants may dominate weed populations if Group 1 and 
Group 10 herbicides are used repeatedly in the same fields. It is recommended to follow effective resistance- management 
strategies. 
 
Suspected Resistance 
Indicators of suspected herbicide resistance include (1) failure to control a weed species normally controlled by the herbicide 
and dose applied; (2) a spreading patch of uncontrolled plants of a particular weed species; and (3) surviving plants mixed 
with controlled individuals of the same species. Likely resistant weeds are assumed to be present if any of these criteria ar e 
met. 
 
Follow as many as possible of the following recommendations to delay herbicide resistance in weeds : 
• Rotate the use of ZALO HERBICIDE or other Group 1 and 10 herbicides with herbicides of different groups that control 
the same weeds. 
• Use tank mixtures with herbicides from a different group if such use is permitted; where information on resistance 
in target weed species is available, use the less resistance-prone partner at a rate that will control the target weed(s) 
equally as well as the more resistance- prone partner. Consult your local extension service or certified crop advisor 
if you are unsure as to which active ingredient is currently less prone to resistance. 
• Users must scout before and after application . Scout field before application to ensure herbicides and rates will be 
appropriate for the weed species and weed sizes present and scout field after application to detect weed escapes 
or shifts in weed species. 
• Adopt an integrated weed -management program for herbicide use that includes scouting and uses historical 
information related to herbicide use and crop rotation and that considers tillage (or other mechanical control 
methods), cultural (e.g., higher crop se eding rates; precision fertilizer application method and timing to favor the 
crop and not the weeds), biological (weed-competitive crops or varieties) and other management practices. 
• After applying herbicide, scout fields to determine the effectiveness of herbicides and other weed control cultural 
or mechanical practices paying particular attention to identify weed profile shift or resistance. If resistance is 
suspected, prevent weed seed production in the affected area by an alternative herbicide from a different group or 
by a mechanical method such as hoeing or tillage. Prevent movement of resistant weed seeds to other fields by 
cleaning harvesting and tillage equipment when moving between fields and planting clean seed. 
• Apply the maximum specified labeled use rate of this product for the most difficult to control weed in the field at 
the specified time (correct weed size) to minimize weed escapes. 
• If a weed pest population continues to progress after treatment with this product, discontinue use of this product, 
and switch to another management strategy or herbicide with a different mode of action, if available. 
• If resistance is suspected in targeted weed species, treat weed escapes with an herbicide having a mechanism of 
action other than group 1 or group 10 and/or use non-chemical methods to remove escapes, as practical, with the 
goal of preventing further seed production. 
• Any herbicide mode of action classification by itself may not adequately address specific weeds that are resistant to 
specific herbicides. Other factors, such as enhanced weed metabolism, may also occur and contribute to weed 
resistance. Consult your state cooperative extension service, professional consultants, or other qualified authorities 
for additional pesticide resistance -management and/or integrated weed -management recommendations for 
specific crops and weed biotypes. 
• Report any incident of non-performance of this product on a targeted weed species or any suspected resistance to 
your retailer or AMVAC representative or call 1-888-462-6822 (AMVAC Customer Support). 
Quizalofop-P-ethyl Group 1 Herbicide 
Glufosinate-ammonium Group 10 Herbicide

Page 9 of 18 
Best Management and Stewardship Practices 
Adopt a diversified weed management system for best stewardship of ZALO HERBICIDE and for optimum weed control. Best 
management practices that diversify weed management include using herbicide treatments with multiple modes of action 
(MOA) that are effective on target weeds. Apply herbicides uniformly using proper application, timing, full use -rates and 
appropriate spray volumes. Use cu ltural (e.g., crop rotation) and mechanical (e.g., tillage) weed management tactics. 
Alternate herbicide-resistant traits and/or use herbicide -resistant trait stacks for more efficient rotation. Correctly identify 
weeds and know where the weeds are in your fields. Start with clean fields. Use effective tillage or burndown herbicide 
programs to control emerged weeds prior to planting. Clean equipment to prevent the spread of weed seeds between fields. 
Use residual herbicides in pre -emergence and early post -emergence applied applications. Scout fields soon after herbicide 
application to identify escaped weeds, population shifts, and herbicide resistant biotypes. Closely monitor problematic areas 
with difficult -to-control weeds or dense weed populations. Control weed escapes using spot herbicide applications, ro pe 
wicking, cultivation or hand removal of weeds or other techniques to stop weed seed production and accumulation in the 
soil bank. Stopping weed seed development will decrease weed populations from year to year and prevent major weed shifts. 
 
Environmental Conditions and Biological Activity 
Apply ZALO HERBICIDE during favorable growing conditions for optimum crop tolerance and weed control. Crops under 
environmental stress are more likely to show injury from any herbicide application. Stressed plants treated with ZALO 
HERBICIDE may show some transient leaf discoloration. These symptoms are temporary and occur rarely. Crop growth is not 
affected. DO NOT apply ZALO HERBICIDE if crop shows injury from prior herbicide applications or environmental stress 
(drought, excessive rainfall, temperature extremes, etc.).
 
 
Cultivation 
Avoid disturbing (e.g., cultivation) treated areas for at least 5 days before and 7 days following an application of ZALO 
HERBICIDE to allow maximum h erbicide absorption and weed control. Avoid deep cultivation that will move d ormant weed 
seeds into the upper soil zone where seeds may germinate. 
 
Insecticide Information 
ZALO HERBICIDE may be used sequentially with soil insecticides or in combination with or sequentially with foliar applied 
insecticides registered for use on that crop. 
 
Cleaning Spray Equipment 
To avoid subsequent injury to desirable crops, thoroughly clean all mixing and spray equipment immediately following 
applications of ZALO HERBICIDE as follows: 
1. Drain tank; thoroughly rinse spray tanks, boom, and hoses with clean water. Loosen and physically remove any visible 
deposits. 
2. Fill the tank with clean water and 1 gal lon of household ammonia* (contains 3% active) for every 100 gal lons of 
water. Flush the hoses, boom, and nozzles with the cleaning solution. Then add more water to completely fill the 
tank. Circulate the cleaning solution through the tank and hoses for at least 15 min. Flush the hoses, boom, and 
nozzles again with the cleaning solution, and then drain the tank. 
3. Remove the nozzles and screens and clean separately in a bucket containing cleaning agent and water. 
4. Repeat step 2. 
5. Rinse the tank, boom, and hoses with clean water. 
6. If only ammonia is used as a cleaner, the rinsate solution may be applied back to the crop(s) specified on this label 
or to a fallow area. DO NOT exceed the maximum labeled use rate. If other cleaners are used, consult the cleaner 
label for rinsate disposal instructions. If no instructions are given, dispose of the rinsate on site or at an approved 
waste disposal facility. 
*Equivalent amounts of an alternate-strength ammonia solution or an AMVAC-approved cleaner can be used in the cleanout 
procedure. Carefully read and follow the individual cleaner instructions. Consult your Ag dealer, applicator, or AMVAC 
representative for a listing of approved cleaners. 
 
II. APPLICATION AND MIXING INSTRUCTIONS 
ZALO HERBICIDE applied postemergence control s many annual broadleaf and grass weeds and some perennial grasses in 
conservation and conventional t illage crop production systems. DO NOT apply ZALO HERBICIDE within 30 feet of a native

Page 10 of 18 
plant community. T o the extent consistent with applicable law, t he applicator is responsible for any loss or damage that 
results from spraying ZALO HERBICIDE in a manner other than specified in this label. In addition, applicator must follow all 
applicable state and local regulations and ordinances regarding spraying. 
 
Spray Coverage 
Glufosinate, a contact herbicide , requires thorough uniform coverage of all vegetation to achieve optimum and consistent 
control of emerged weeds. Dense leaf canopies can prevent adequate spray coverage resulting in poor weed control. 
Quizalofop-P-ethyl, a systemic herbicide , does not require as thorough coverage. The activity of both active ingredients is 
optimized when using spray nozzles that produce medium (M) to coarse size (C) droplets (follow the ASABE standards 572.1 
shown under spray drift management below). Applying ZALO HERBICIDE with nozzles that produce very coarse (VC), 
extremely coarse (XC), or ultra coarse (UC) spray droplets can result in at least a 30% reduction in weed control. DO NOT use 
flood jet nozzles, controlled droplet application equipment, or air -assisted spray equipment. 
 
Application Methods and Equipment 
Aerial Application 
ZALO HERBICIDE can be applied aerially using a minimum of 10 GPA. See the Spray Drift Management section of this label for 
additional information on proper application of ZALO HERBICIDE. 
 
Ground Application 
Apply ZALO HERBICIDE with properly calibrated ground equipment using a minimum of 15 or more gallons of water per acre 
(GPA). A spray volume of 20 GPA is preferred. Use higher water volumes when treating larger weeds and/or dense weed 
infestations. ZALO HERBICIDE applications can be made with drop nozzles if the crop canopy prevents adequate weed 
coverage when using broadcast applications methods. Apply at ground speed of less than 15 mph to attain adequate 
coverage. 
 
After using ZALO HERBICIDE, thoroughly clean spray equipment . See the Cleaning Spray Equipment section of this label for 
instructions. 
 
SPRAY DRIFT MANAGEMENT 
SPRAY DRIFT 
AERIAL APPLICATIONS 
• The spray boom must be mounted on the aircraft so as to minimize drift caused by wing tip or rotor blade vortices. 
• The boom length must not exceed 75% of the wingspan or 90% of the rotor blade diameter. 
• DO NOT release spray at a height greater than 10 ft above the ground or crop canopy, unless a greater application 
height is necessary for pilot safety. 
• Select nozzle and pressure that deliver medium to coarse spray droplets as indicated in nozzle manufacturer’s 
catalogues and in accordance with ASABE Standard 572.1. 
• Applicators must use ½ swath displacement upwind of the downwind edge of the field. 
• DO NOT apply when wind speeds exceed 10 mph at the application site. 
• DO NOT apply during temperature inversions. 
 
SPRAY DRIFT 
GROUND APPLICATIONS 
• Spray at the appropriate boom height based on nozzle selection and nozzle spacing, but DO NOT exceed a boom 
height of 24 inches above target pest or crop canopy. 
• Set boom to lowest effective height over the target pest or crop canopy based on equipment manufacturer’s 
directions. 
• Automated boom height controllers are recommended with large booms to better maintain optimum nozzle to 
canopy height. Excessive boom height will increase the potential for spray drift. 
• Select nozzle and pressure that deliver medium to coarse spray droplets as indicated in nozzle manufacturer’s 
catalogues and in accordance with ASABE Standard 572.1.

Page 11 of 18 
• DO NOT apply when wind speeds exceed 10 mph at the application site. 
• DO NOT apply during temperature inversions. 
 
SPRAY DRIFT ADVISORIES 
1. Pollinator Advisory - This product contains herbicide s. Follow all label directions and precautions to minimize 
potential off-target exposure in order to prevent effects to non-target plants adjacent to the treated site which may 
serve as habitat or forage for pollinators. 
2. Spray Drift Management - The interaction of many equipment and weather-related factors determines the potential 
for spray drift. The applicator is responsible for considering all these factors when making application decisions. 
 
IMPORTANCE OF DROPLET SIZE 
The most effective way to reduce drift potential is to apply large droplets. The best drift management strategy is to apply the 
largest droplets that provide sufficient coverage and control. The presence of sensitive species nearby, the environmental 
conditions, and pest pressure may affect how an applicator balances drift control and coverage. APPLYING LARGER DROPLETS 
REDUCES DRIFT POTENTIAL BUT WILL NOT PREVENT DRIFT IF APPLICATIONS ARE MADE IMPROPERLY OR UNDER 
UNFAVORABLE ENVIRONMENTAL CONDITIONS! See Wind, Temperature and Humidity, and Temperature Inversions sections 
of this label. 
 
Techniques for Controlling Droplet Size: 
• Volume - Use high flow rate nozzles to apply the highest practical spray volume. Nozzles with higher rated flows 
produce larger droplets. 
• Pressure - Use the lower spray pressures recommended for the nozzle. Higher pressure reduces droplet size and 
does not improve canopy penetration. WHEN HIGHER FLOW RATES ARE NEEDED, USE A HIGHER CAPACITY NOZZLE 
INSTEAD OF INCREASING PRESSURE. 
• Nozzle Type - Use a nozzle type that is designed for the intended application. With most nozzle types, narrower 
spray angles produce larger droplets. Consider using low-drift nozzles. 
 
Controlling Droplet Size – Aircraft: 
• Number of Nozzles - Use the minimum number of nozzles with the highest flow rate that provide uniform coverage. 
• Nozzle Orientation - Orienting nozzles so that the spray is emitted backwards, parallel to the airstream will produce 
larger droplets than other orientations. AVOIDING SPRAY DRIFT IS THE RESPONSIBILITY OF THE APPLICATOR. 
• Nozzle Type - Solid stream nozzles (such as disc and core with swirl plate removed) oriented straight back produce 
larger droplets than other nozzle types. 
• Boom Length - Longer booms increase drift potential. Therefore, a shorter boom length is recommended. 
• Application Height - Application more than 10 ft above the canopy increases the potential for spray drift. 
 
Boom Height. Setting the boom at the lowest referenced height (if specified) which provides uniform coverage reduces the 
exposure of droplets to evaporation and wind. For ground equipment, the boom should remain level with the crop and have 
minimal bounce. 
 
Drift Reduction Technology (DRT). The EPA Drift Reduction Technology (DRT) Program was developed to encourage the 
manufacture, marketing, and use of spray technologies scientifically verified to significantly reduce pesticide drift. The use of 
DRTs should result in significantly less pesticide from spray applications drifting and being deposited in areas not targeted by 
those applications, compared to spray technologies that do not meet the minimum DRT standard. EPA-verified drift reduction 
technologies (DRTs) and their ratings will be added to the following webpage as they become available: 
https://www.epa.gov/reducing-pesticide-drift

Page 12 of 18 
WIND 
Drift potential increases at wind speeds of less than 3 mph (due to inversion potential) or more than 10 mph. However, many 
factors including droplet size and equipment type determine drift potential at any given wind speed. AVOID APPLICATIONS 
DURING GUSTY OR WINDLESS CONDITIONS. Note: Local terrain can influence wind patterns. Every applicator needs to be 
familiar with local wind patterns and how they affect spray drift. 
 
TEMPERATURE AND HUMIDITY 
When making applications in hot and dry conditions, set up equipment to produce larger droplets to reduce effects of 
evaporation. 
 
TEMPERATURE INVERSIONS 
Drift potential is high during a temperature inversion. Temperature inversions restrict vertical air mixing which causes smal l 
suspended droplets to remain close to the ground and move laterally in a concentrated cloud. Temperature inversions are 
characterized by increasing temperature with altitude and are common on nights with limited cloud cover and light to no 
wind. They begin to form as the sun sets and often continue into the morning. Their presence can be indicated by ground fog; 
however, if fog is not present, inversions can also be identified by the movement of smoke from a ground source or an aircraft 
smoke generator. Smoke that layers and moves laterally in a concentrated cloud (under low wind conditions) indicates an 
inversion while smoke that moves upward and rapidly dissipates indicates good vertical air mixing. 
 
SHIELDED SPRAYERS 
Shielding the boom or individual nozzles can reduce the effects of wind. However, it is the responsibility of the applicator to 
verify that the shields are preventing drift and not interfering with uniform deposition of the product. 
 
Agriculturally approved drift-reducing additives may also be used in accordance with product labels. 
 
III. ADDITIVES 
Postemergence applications of ZALO HERBICIDE require the addition of an adjuvant and a nitrogen fertilizer source to achieve 
optimum weed control. When using an adjuvant with this product, selecting an adjuvant that meets the standards of the 
Chemical Producers and Distributors Association (CPDA) adjuvant certification program is advised . 
 
ADJUVANTS:
 Use petroleum oil concentrate (COC) adjuvants at 1% v/v (1 gallon/100 gallons of water). Use nonionic 
surfactants (NIS) with at least 90% ai at 0.25 to 0.5% v/v. Use MSO (methylated seed oil) adjuvants at 1% v/v or HSOC (high 
surfactant oil concentrate) adjuvants at 0.5% v/v. NIS, MSO, and HSOC adjuvants may not be more effective than COC 
adjuvants. For adjuvant use when tank-mixing with other herbicides refer to Section V. Tank Mix Information. 
 
AND 
 
NITROGEN FERTILIZER SOURCE: Always add spray grade ammonium sulfate (AMS) at 3 lbs/A. A liquid AMS product which 
provides an equivalent rate of AMS per acre may be used. Commercial liquid solutions of AMS contain approximately 3.4 lbs 
of AMS per gallon. 
 
 
IV. MIXING ORDER INSTRUCTIONS 
ZALO HERBICIDE is formulated to mix readily in water. Prior to adding ZALO HERBICIDE to the spray tank, ensure that the 
spray tank is thoroughly clean, particularly if a n herbicide with the potential to injure target crops was previously used. It is 
the pesticide user’s responsibility to ensure that all products are registered for the intended use. Read and follow the 
applicable restrictions and limitations and directions for use on all product labels involved in tank mixing. Users must foll ow 
the most restrictive directions for use and precautionary statements of each product in the tank mixture. 
 
Following are mixing order guidelines for ZALO HERBICIDE either alone or with other components, including spray adjuvants:

Page 13 of 18 
WATER: 
1. Fill the spray tank ½ to ¾ full with clean water. 
2. Add ammonium sulfate (AMS) to the spray tank. 
3. Add the required amount of ZALO HERBICIDE to the spray tank while agitating. 
4. After ZALO HERBICIDE has visibly dispersed, continue agitation and add spray additives while filling the remainder of the 
tank with water. 
 
TANK-MIX PREPARATION: 
When tank mixing ZALO HERBICIDE with specified pesticides, add the other pesticides and other components in the following 
order, all while agitating: 
1. Fill spray tank ½ to ¾ full with clean water and start agitation. 
2. Add soluble packet products and thoroughly mix. 
3. Add WP (wettable powder), DG (dispersible granule), DF (dry flowable ). 
4. Add ammonium sulfate (AMS) to the spray tank. 
5. Add F (liquid flowable) formulations. 
6. Add ZALO HERBICIDE and thoroughly mix. 
7. Add EC (emulsifiable concentrate) and liquid products. 
8. Add fertilizer and spray adjuvants to the spray tank. 
9. Use a silicone based anti-foam agent if foaming occurs. 
10. Fill the remainder of the tank with water. 
11. Maintain adequate agitation until all contents in the tank are applied. 
 
V. TANK MIX INFORMATION: 
ZALO HERBICIDE may be tank mixed with other registered herbicides to broaden weed spectrum and/or provide residual 
weed control . This includes products to control other registered pests (e.g. insecticides, fungicides, biologicals). It is the 
pesticide user’s responsibility to ensure that all products in the listed mixtures are registered for the intended use. Read and 
follow the most restrictive of all applicable restrictions, limitations and directions for use on all products included in any tank 
mix. 
 
Postemergence herbicides can antagonize the activity of quizalofop -P-ethyl and reduce grass and volunteer corn control. 
Broadleaf herbicides in Group 2 (e.g., chlorimuron, cloransulam, imazaquin) , Group 4 (e.g., 2,4-D, dicamba), Group 6 (e.g., 
bentazon) and Group 14 (e.g., fomesafen, lactofen) have been documented as antagonistic. To prevent reduced grass control, 
apply ZALO herbicide either 1 day before or 7 days after broadleaf herbicide s. Tank mix directions are for use only in states 
where the sequential or tank mix product and application site is registered. Refer to CROP USE DIRECTIONS AND 
RESTRICTIONS (Section VII) for more details and for specific tank mix restrictions. 
 
DO NOT use liquid fertilizer as a carrier for postemergence applications of ZALO HERBICIDE. 
 
VI. ROTATIONAL CROP RESTRICTIONS 
The following rotational crops may be planted after uniformly applying ZALO HERBICIDE. If ZALO HERBICIDE is tank-mixed 
with other herbicides, the label replanting restrictions for these herbicides must also be followed. 
 
Table 3. Crop Rotation Intervals for ZALO HERBICIDE 
 
Rotational Crop 
Rotational Interval 
(Minimum rotational crop planting interval from last 
application) 
Canola, cotton, soybean, quizalofop-P-ethyl- resistant corn and 
sugarbeet. 
May be planted any time 
Brassica leafy vegetables, leafy vegetables, root and tuber vegetables. 
Corn, sweet corn, small grains (wheat barley, oat, rye, buckwheat, 
teosinte, and triticale). 
 
120 days 
All other crops 180 days

Page 14 of 18 
VII. CROP USE DIRECTIONS AND RESTRICTIONS 
 
Table 4. Application Directions for Specific Crop Use Directions and Restrictions 
 
Crops Use rate/A 
(fl oz) 
No. of 
applications 
/crop year 
Preharvest 
Interval 
(days) 
Maximum 
rate/acre/ 
crop year 
fl oz 
Application Instructions 
 
Glufosinate-
resistant canola 
 
22-29 
 
2 
 
 
65 
 
58 
 
Apply by ground and aerial application from 
cotyledon up to 14 days of anticipated bloom. 
 
 
Restrictions: 
DO NOT use in AL, DE, GA, KY, MD, NJ, NC, SC, TN, VA and WV. 
In the State of New York Only: DO NOT use in Nassau and Suffolk Counties. 
DO NOT use liquid fertilizer as a carrier for applications of ZALO HERBICIDE. 
DO NOT graze or feed forage, hay, or straw from treated areas to livestock. 
DO NOT apply this product through any type of irrigation system. 
DO NOT contaminate any body of water. 
DO NOT reapply within 7 days of previous application. 
DO NOT harvest within 65 days of previous application. 
DO NOT exceed 2 applications per year. 
Maximum Single Application: 
DO NOT apply more than 29 fl oz/A (0.519 lb glufosinate ammonium/A and 0.052 lb quizalofop-p-ethyl/A). 
Maximum Annual Application: 
DO NOT apply more than 58 fl oz/A ZALO Herbicide (1.037 lb glufosinate ammonium/A and 0.104 lb quizalofop-p-
ethyl/A) per calendar year. 
DO NOT exceed 1.59 lb glufosinate ammonium/A and 0.124 lb quizalofop-p-ethyl/A per calendar year. 
 
Crops Use rate/A 
(fl oz) 
No. of 
applications 
/crop year 
Preharvest 
Interval 
(days) 
Maximum 
rate/acre/ 
crop year 
fl oz 
 
Application Instructions 
 
Glufosinate-
resistant cotton 
 
 
 
32-43 
 
2 
 
 
80 
 
69 
 
Apply by ground and aerial application from 
emergence up to 14 days of anticipated bloom. 
Tank mixing with certain broadleaf herbicides may 
result in reduced grass control. To prevent reduced 
grass control, apply ZALO HERBICIDE either 1 day 
before or 7 days after the broadleaf herbicide. 
 
 
Restrictions: 
DO NOT apply to glufosinate-tolerant cotton in Florida, south of Tampa (Florida Route 60), or in Hawaii, except for 
test plots or breeding nurseries. 
In the State of New York Only: DO NOT use in Nassau and Suffolk Counties. 
DO NOT use liquid fertilizer as a carrier for applications of ZALO HERBICIDE. 
DO NOT feed cottonseed from treated areas to livestock. 
DO NOT apply this product through any type of irrigation system. 
DO NOT contaminate any body of water. 
DO NOT reapply within 10 days of previous application. 
DO NOT harvest within 80 days of previous application. 
DO NOT exceed 2 applications per year. 
DO NOT apply within 14 days of anticipated bloom of crop.

Page 15 of 18 
Crops Use rate/A 
(fl oz) 
No. of 
applications 
/crop year 
Preharvest 
Interval 
(days) 
Maximum 
rate/acre/ 
crop year 
fl oz 
 
Application Instructions 
Maximum Single Application: 
DO NOT apply more than 43 fl oz/A (0.769 lb glufosinate ammonium/A and 0.077 lb quizalofop-p-ethyl/A). 
Maximum Annual Application: 
DO NOT apply more than 69 fl oz/A ZALO Herbicide (1.234 lb glufosinate ammonium/A and 0.124 lb quizalofop-p-
ethyl/A) per calendar year. 
DO NOT exceed 1.59 lb glufosinate ammonium/A and 0.124 lb quizalofop-p-ethyl/A per calendar year. 
 
Glufosinate- 
resistant 
soybean 
 
32-43 
 
2 
 
 
80 
 
69 
 
Apply by ground and aerial application from 
emergence up to bloom or R1 growth stage. 
 
Tank mixing with other broadleaf herbicides will 
result in reduced grass control. To prevent reduced 
grass control, apply ZALO HERBICIDE either 1 day 
before or 7 days after the broadleaf herbicide. 
 
 
 
Restrictions: 
In the State of New York Only: DO NOT use in Nassau and Suffolk Counties. 
DO NOT use liquid fertilizer as a carrier for applications of ZALO HERBICIDE. 
DO NOT graze or feed forage, hay, or straw from treated areas to livestock.DO NOT apply this product through any 
type of irrigation system. 
DO NOT contaminate any body of water. 
DO NOT reapply within 10 days of previous application. 
DO NOT harvest within 80 days of previous application. 
DO NOT exceed 2 applications per year. 
Maximum Single Application: 
DO NOT apply more than 43 fl oz/A (0.769 lb glufosinate ammonium/A and 0.077 lb quizalofop-p-ethyl/A) 
Maximum Annual Application: 
DO NOT apply more than 69 fl oz/A ZALO Herbicide (1.234 lb glufosinate ammonium/A and 0.124 lb quizalofop-p-
ethyl/A) per calendar year. 
DO NOT exceed 1.59 lb glufosinate ammonium/A and 0.124 lb quizalofop-p-ethyl/A per calendar year. 
 
Pome Fruit 
Group 11-10: 
apple, azarole, 
crabapple, 
loquat, 
mayhaw, 
medlar, pear, 
quince, 
tejocote, 
cultivars, 
varieties 
and/or hybrids 
of these. 
 
Stone Fruit 
Group 12-12: 
apricot, 
capulin, cherry, 
jujube, 
nectarine; 
peach, plum, 
 
46 
 
2 
 
 
14 
 
92 
 
Apply as a banded and/or directed postemergence 
spray or spot spray treatment in pome and stone fruit 
crops to weeds less than 3 inches tall. 
Apply ZALO Herbicide as a directed spray in a band 
extending out a minimum of 3 feet on each side of 
the row in 10-40 gallons of water/acre. 
 
Banded applications should follow the formula 
below to calculate the amount of herbicide needed 
for orchard strip spray treatment: 
 
(Band width in feet/Row width in feet) 
x Rate per broadcast acre 
= Amount of ZALO Herbicide needed 
 
For spot or directed-spray applications, use ZALO 
Herbicide at 1.15 fl oz of product per gallon of spray 
solution. Use AMS at 1.2 oz/gal spray solution and 
COC at 1.28 fl oz/gal spray solution. 
 
Apply to weeds until wet but prior to runoff. Ensure 
uniform and complete coverage.

Page 16 of 18 
Crops Use rate/A 
(fl oz) 
No. of 
applications 
/crop year 
Preharvest 
Interval 
(days) 
Maximum 
rate/acre/ 
crop year 
fl oz 
 
Application Instructions 
prune plum, 
plumcot, sloe; 
cultivars, 
varieties, 
and/or hybrids 
of these. 
 
Restrictions: 
DO NOT use in the state of New York. 
DO NOT allow herbicide solution, spray, drift or mist to contact green bark, stems, or foliage of trees, vines, and berries 
as injury may occur. 
DO NOT apply to suckers. 
DO NOT apply within 14 days of anticipated bloom of fruit tree crops. 
DO NOT graze, harvest, and/or feed treated orchard areas cover crops to livestock. 
DO NOT apply this product through any type of irrigation system. 
DO NOT contaminate any body of water. 
DO NOT apply by aerial application. 
DO NOT reapply within 14 days of previous application for pome fruit. 
DO NOT reapply within 28 days of previous application for stone fruit. 
DO NOT harvest within 14 days of previous application. 
DO NOT exceed 2 applications per year. 
Maximum Single Application: DO NOT apply more than 46 fl oz/A (0.823 lb glufosinate ammonium/A and 0.083 lb 
quizalofop-p-ethyl/A) 
Maximum Annual Application: 
DO NOT apply more than 92 fl oz/A ZALO Herbicide (1.646 lb glufosinate ammonium/A and 0.165 lb quizalofop-p-
ethyl/A) per calendar year. 
DO NOT exceed 3.0 lb glufosinate ammonium/A per calendar year in stone fruit and 4.5 lb glufosinate ammonium/A 
per calendar year in pome fruit. DO NOT exceed 0.165 lb quizalofop-p-ethyl/A per calendar year in stone or pome fruit. 
 
VIII. SEQUENTIAL HERBICIDE COMBINATIONS AND USES 
ZALO HERBICIDE can be used in sequential programs following other registered herbicides for the target crop to broaden 
weed control spectrum and/or provide residual weed control . Unless indicated otherwise in Section VII. CROP USE 
DIRECTIONS AND RESTRICTIONS, multiple ZALO HERBICIDE applications can be made sequentially to control emerged grass 
and broadleaf weed species. 
 
STORAGE AND DISPOSAL 
DO NOT contaminate water, food or feed by storage, disposal, or cleaning of equipment. 
 
PESTICIDE STORAGE: 
Store product in original container only. Store product in a cool, dry place. DO NOT store this product under wet conditions. 
If this product has been stored where freezing temperatures have occurred agitate or mix contents of container well before 
use. Avoid cross-contamination with other pesticides. 
 
PESTICIDE DISPOSAL: 
Wastes resulting from the use of this product may be disposed of on site or at an approved waste disposal facility. Improper 
disposal of excess pesticide, spray mix, or rinsate is a violation of federal law. If these wastes cannot be disposed of according 
to label instructions contact state agency responsible for pesticide regulation or the Hazardous Waste representative at the 
nearest EPA Regional Office for guidance. 
 
CONTAINER HANDLING: 
FOR NONREFILLABLE RIGID PLASTIC 2.5- GALLON CONTAINERS AND OTHER PLASTIC CONTAINERS OF GREATER THAN 1 -
GALLON BUT EQUAL TO OR LESS THAN 5 -GALLON CAPACITY: Nonrefillable plastic container. DO NOT reuse or refill this 
container. 
Triple rinse or pressure rinse (or equivalent) this container promptly after emptying. Triple rinse as follows: Empty the 
remaining contents into application equipment or a mix tank and drain for 10 seconds after the flow begins to drip. Fill the 
container 1/4 full with water and recap. Shake for 10 seconds. Pour rinsate into application equipment or a mix tank or store

Page 17 of 18 
rinsate for later use or disposal. Drain for 10 seconds after the flow begins to drip. Repeat this procedure two more times. 
Pressure rinse as follows: Empty the remaining contents into application equipment or a mix tank and continue to drain for 
10 seconds after the flow begins to drip. Hold container upside down over application equipment or mix tank or collect rinsate 
for later use or disposal. Insert pressure rinsing nozzle in the side of the container, and rinse at about 40 PSI for at least 30 
seconds. Drain for 10 seconds after the flow begins to drip. 
Then offer this container for recycling, if available. If recycling is not available dispose of in accordance with federal, s tate, 
and local regulations and procedures which may include puncturing the properly rinsed container and disposing in a sanitary 
landfill. 
FOR NONREFILLABLE RIGID PLASTIC 30 -GALLON CONTAINERS AND OTHER PLASTIC CONTAINERS OF GREATER THAN 5-
GALLON CAPACITY: Nonrefillable plastic container. DO NOT reuse or refill this container. 
Triple rinse or pressure rinse (or equivalent) this container promptly after emptying. 
Triple rinse as follows: Empty the remaining contents into application equipment or a mix tank. Fill the container 1/4 full with 
water. Replace and tighten closures. Tip container on its side and roll it back and forth, ensuring at least one revolution, fo r 
30 seconds. Stand the container on its end and tip it back and forth several times. Turn the container over onto its other end 
and tip it back and forth several times. Empty the rinsate into application equipment or a mix tank or store rinsate for late r 
use or disposal. Drain for 10 seconds after the flow begins to drip. Repeat this procedure two more times. 
Pressure rinse as follows: Empty the remaining contents into application equipment or a mix tank and continue to drain for 
10 seconds after the flow begins to drip. Hold container upside down over application equipment or mix tank or collect rinsate 
for later use or disposal. Insert pressure rinsing nozzle in the side of the container, and rinse at about 40 PSI for at least 30 
seconds. Drain for 10 seconds after the flow begins to drip. 
Then offer this container for recycling, if available. If recycling is not available, dispose of in accordance with federal, state, 
and local regulations and procedures which may include puncturing the properly rinsed container and disposing in a sanitary 
landfill. 
FOR PLASTIC REFILLABLE CONTAINERS, EXCEPT TRANSPORT CONTAINERS: Refillable plastic container. Refill this container 
with pesticide only. DO NOT reuse this container for any other purpose. 
Cleaning this container before refilling is the responsibility of the refiller. Cleaning this container before final disposal is the 
responsibility of the person disposing of the container. To clean this container before final disposal, empty the remaining 
contents from this container into application equipment or a tank -mix. Fill the container about 10 percent full with water. 
Agitate vigorously or recirculate water with the pump for 2 minutes. Pour or pump rinsate into application equipment or 
rinsate collection system. Repeat this rinsing procedure two more times. Then offer this container for recycling, if available. 
FOR ALL TRANSPORT CONTAINERS AS DEFINED IN 40 CFR 156.3 : Emptied container retains vapor and product residue. 
Observe all precautions stated on this label until the container is cleaned, reconditioned, or destroyed. Prior to refilling, 
inspect carefully for damage such as cracks, punctures, abrasions, and worn- out threads and closures. Clean thoroughly 
before reuse for transportation of a material of different composition or before retiring this transport vehicle from service. 
LIMITED WARRANTY AND DISCLAIMER 
The manufacturer warrants (a) that this product conforms to the chemical description on the label; and (b) that the 
directions, warnings, and other statements on this label are based upon responsible experts' evaluations of reasonable 
tests of effectiveness, of toxicity to laboratory animals and to plants and residues on food crops, and upon reports of 
field experience. Tests have not been made on all varieties of food crops and plants, or in all states or under all conditions. 
THIS WARRANTY DOES NOT EXTEND TO THE USE OF THIS PRODUCT CONTRARY TO LABEL INSTRUCTIONS, OR UNDER 
CONDITIONS NOT REASONABLY FORESEEABLE. 
THERE ARE NO EXPRESS WARRANTIES OTHER THAN THOSE SET FORTH HEREIN. TO THE EXTENT CONSISTENT WITH 
APPLICABLE LAW THE MANUFACTURER NEITHER MAKES NOR INTENDS, NOR DOES IT AUTHORIZE ANY AGENT OR 
REPRESENTATIVE, TO MAKE ANY OTHER WARRANTIES, EXPRESS OR IMPLIED, AND IT EXPRESSLY EXCLUDES AND 
DISCLAIMS ALL IMPLIED WARRANTIES OF MERCHANTABILITY OF FITNESS FOR A PARTICULAR PURPOSE, OR ANY 
WARRANTY OF QUALITY OR PERFORMANCE. THIS WARRANTY DOES NOT EXTEND TO, AND THE BUYER SHALL BE SOLELY

Page 18 of 18 
RESPONSIBLE FOR, ANY AND ALL LOSS OR DAMAGE WHICH RESULTS FROM THE USE OF THIS PRODUCT IN ANY MANNER 
WHICH IS INCONSISTENT WITH THE LABEL DIRECTIONS, WARNINGS OR CAUTIONS. 
 
TO THE EXTENT CONSISTENT WITH APPLICABLE LAW BUYER'S EXCLUSIVE REMEDY AND MANUFACTURER'S OR SELLER'S 
EXCLUSIVE LIABILITY FOR ANY AND ALL CLAIMS, LOSSES, DAMAGES, OR INJURIES RESULTING FROM THE USE OR HANDLING 
OF THIS PRODUCT, WHETHER OR NOT BASED IN TORT, CONTRACT, NEGLIGENCE, STRICT LIABILITY IN TORT OR OTHERWISE, 
SHALL BE LIMITED AT THE MANUFACTURER'S OPTION TO REPLACEMENT OF, OR THE REPAYMENT OF THE PURCHASE PRICE 
FOR, THE QUANTITY OF PRODUCT WITH RESPECT TO WHICH DAMAGES ARE CLAIMED. TO THE EXTENT CONSI STENT WITH 
APPLICABLE LAW MANUFACTURER OR SELLER SHALL NOT BE LIABLE FOR SPECIAL, INDIRECT OR CONSEQUENTIAL 
DAMAGES RESULTING FROM THE USE OR HANDLING OF THIS PRODUCT. 
 
AMVAC offers this product, and Buyer accepts it, subject to the foregoing Limited Warranty which may be varied only by 
agreement in writing signed by an authorized representative of AMVAC. 
 
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Newport Beach, CA 92660 U.S.A. 
 
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