crop-chem-docs/corpus/epa_ppls/5905-641.md

# HM-1821-A Herbicide

- EPA Reg No: **5905-641**
- Registrant: HELENA AGRI-ENTERPRISES, LLC, D/B/A HELENA CHEMICAL COMP
- Signal word: Caution
- Active ingredients: S-Metolachlor (41.45%); Tolpyralate (1.12%)
- Label accepted: 2026-08-12
- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/005905-00641-20260812.pdf

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August 12, 2026
Jayne Walz
Director of Registrations
Helena Agri-Enterprises, LLC.
d/b/a Helena Chemical Company
225 Schilling Boulevard, Suite 300
Collierville, TN 38017
Subject: Approval of Label Amendment; Only Indicated Changes Reviewed – Updated
hotline information, Revised crop rotational intervals to match approved 
labels, revised glyphosate and glufosinate tank mix instructions, revised 
max yearly rate restriction for corn to match approved labels, and other 
miscellaneous updates.
 Product Name: HM-1821-A Herbicide
EPA Registration Number: 5905-641
Application Date: June 16, 2022
Case Number: 480159
Dear Jayne Walz:
The amended label referred to above, submitted in connection with registration under the 
Federal Insecticide, Fungicide, and Rodenticide Act (FIFRA), as amended, is acceptable.
However, EPA reviewed only the label changes highlighted, marked, or otherwise indicated on 
the submitted label. Any other changes to the previously approved label that were not clearly 
highlighted, marked, or otherwise indicated in your submission were not reviewed and may 
form the basis of regulatory and/or enforcement action if later discovered by the Agency. 
Further, submission of a label amendment application with unidentified changes may be 
considered a knowing submission of false information to the Agency. This approval does not 
affect any conditions that were previously imposed on this registration. You continue to be 
subject to existing conditions on your registration and any deadlines connected with them.
The label submitted with the application has been stamped “Accepted Only Indicated Revisions 
Reviewed” and is enclosed for your records. 
This labeling supersedes all previously accepted labeling. You must submit one copy of the final 
printed labeling before you release the product for shipment with the new labeling. In 
accordance with 40 C.F.R. § 152.130(c), you may distribute or sell this product under the

Page 2 of 2 
EPA Reg. No. 5905-641 
Case Number 480159 
 
previously approved labeling for 18 months from the date of this letter. After 18 months, you 
may only distribute or sell this product if it bears this new revised labeling or subsequently 
approved labeling. “To distribute or sell” is defined under FIFRA section 2(gg) and its 
implementing regulation at 40 C.F.R. § 152.3. 
 
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 contains any false or misleading statement, design, or graphic, the 
product may be misbranded and unlawful to sell or distribute under FIFRA Sections 2(q)(1)(A) 
and 12(a)(1)(E). 40 C.F.R. § 156.10(a)(5) lists examples of statements EPA may consider false or 
misleading. In addition, regardless of whether a website is referenced on the product label, 
claims made as part of the product’s sale or distribution may not substantially differ from those 
claims approved through the registration process under FIFRA Section 12(a)(1)(B). 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 
product will be referred to the EPA’s Office of Enforcement and Compliance Assurance. 
 
Your release for shipment of the product constitutes acceptance of these conditions. If these 
conditions are not complied with, the registration will be subject to cancellation in accordance 
with FIFRA section 6. 
 
If you have any questions, please contact Curtis Hildebrandt at 202-566-2770 or at 
hildebrandt.curtis@epa.gov. 
 
 S i n c e r e l y , 
 Kable Bo Davis 
 Kable Bo Davis; Senior Advisor 
 O f f i c e o f P e s t i c i d e P r o g r a m s 
 R e g i s t r a t i o n D i v i s i o n ; I m m e d i a t e O f f i c e 
 
 
 
Enclosure

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Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
S-Metolachlor GROUP 15 HERBICIDE 
Tolpyralate GROUP 27 HERBICIDE 
 
 
HM-1821-A HERBICIDE 
 
 
 
A Preemergence and Postemergence Herbicide for Control of Annual Grass and Broadleaf 
Weeds in Field Corn, Seed Corn, Sweet Corn, and Yellow Popcorn 
 
Sale, use, and distribution of this product in Nassau and Suffolk Counties in the State of New 
York is prohibited. 
 
 
ACTIVE INGREDIENTS: 
S-Metolachlor ((S)-2-Chloro-N-(2-ethyl-6-methylphenyl)-N-(2-methoxy-1-methylethyl) acetamide) 
………………………………………………………………………………………………………………. 41.45% 
Tolpyralate ((RS)-1-(1-Ethyl-4-(4-mesyl-3-(2-methoxyethoxy)-o-toluoyl)pyrazol-5-yloxy)ethyl 
 methyl carbonate)…………………………………………………………………………………………… 1.12% 
OTHER INGREDIENTS:…………………………………………………………………………………………. 57.43% 
TOTAL:………………………………………………………………………………………............................. 100.00% 
 
 
Contains petroleum distillates. 
Contains S-metolachlor at 3.72 lbs./gal and Tolpyralate at 0.10 lbs./gal . 
Contains safener for corn. 
 
 
KEEP OUT OF REACH OF CHILDREN 
CAUTION 
See additional precautionary statements, directions for use, and storage and disposal 
instructions inside booklet. 
 
 
 
EPA Reg. No. 5905-641 AD 012623 
EPA Est. No. NET CONTENTS: ___ Gallons 
 
 
Manufactured for: 
Helena Agri-Enterprises, LLC 
225 Schilling Boulevard, Suite 300 
Collierville, TN 38017 
 
 
 
 
 
 
 
 
5905-641
08/12/2026

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Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
 
FIRST AID 
If swallowed x Immediately call a poison control center or doctor. 
x Do not induce vomiting unless told to do so by the poison control center or 
doctor. 
x Do not give any liquid to the person. 
x Do not give anything by mouth to an unconscious person. 
If in eyes x Hold eye open and rinse slowly and gently with water for 15-20 minutes. 
x Remove contact lenses, if present, after the first 5 minutes, then continue 
rinsing eye. 
x Call a poison control center or doctor for treatment advice. 
If on skin or 
clothing 
x Take off contaminated clothing. 
x Rinse skin immediately with plenty of water for 15-20 minutes. 
x Call a poison control center or doctor for treatment advice. 
HOTLINE NUMBER 
Have the product container or label with you when calling a poison control center or doctor or 
going for treatment. You may also contact CHEMTREC at (800) 424-9300, for 24-hour medical 
emergency assistance (human or animal) and chemical emergency assistance (spill, leak, fire, or 
accident). 
NOTE TO PHYSICIAN 
Contains petroleum distillate. Vomiting may cause aspiration pneumonia. 
 
PRECAUTIONARY STATEMENTS 
HAZARDS TO HUMANS AND DOMESTIC ANIMALS 
CAUTION 
Harmful if swallowed. Causes moderate eye irritation. Avoid contact with skin, eyes or clothing. 
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: 
x Protective eyewear (safety glasses, goggles) 
x Long-sleeved shirt and long pants 
x Chemical-resistant gloves made of barrier laminate or Viton® •14 mils 
x Shoes plus socks 
 
Follow manufacturer’s instructions for cleaning/maintaining PPE. If no such instructions for 
washables, use detergent and hot water. Keep and wash PPE separately from other laundry. 
 
User Safety 
Recommendations 
Users should: 
x Remove clothing/PPE immediately if pesticide gets inside. Then wash thoroughly and 
put on clean clothing. 
x 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. 
 
Engineering Controls 
When handlers use closed systems or enclosed cabs in a manner that meets the requirements 
listed in the Worker Protection Standard (WPS) for agricultural pesticides [40 CFR 170.607(d-e)], 
the handler PPE requirements may be reduced or modified as specified in the WPS.

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Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
 
ENVIRONMENTAL HAZARDS 
Do not apply directly to water, to areas where surface water is present, or to intertidal areas below 
the mean high water mark. Do not contaminate water when disposing of equipment wash water or 
rinsate. Do not apply where/when conditions could favor runoff. 
 
Reporting Ecological Incidents: 
To report ecological incidents, including mortality, injury, or harm to plants and animals, call 901-
761-0050. 
 
Ground Water Advisory 
S-metolachlor is known to leach through soil into groundwater under certain conditions as a result 
of label use. This chemical may leach into groundwater if used in areas where soils are permeable, 
particularly where the water table is shallow. 
 
Tolpyralate has properties and characteristics associated with chemicals detected in groundwater. 
It may leach into groundwater if used in areas where soils are permeable, particularly where the 
water table is shallow. 
 
Surface Water Advisory 
This product has the potential to contaminate surface water through ground spray drift and runoff of 
rain water. This product is classified as having high potential for reaching surface water via runoff 
for several months or more after application. Conditions that contribute to this potential include 
poorly drained or wet soils with readily visible slopes toward adjacent surface waters, frequently 
flooded areas, areas overlaying extremely shallow groundwater, areas with in-field canals or 
ditches that drain to surface water, areas not separated from adjacent surface waters with 
vegetated filter strips, and areas overlaying tile drainage systems that drain to surface water. 
 
A level, well-maintained buffer strip between areas to which this product is applied and surface 
water features including ponds, streams, and springs will reduce the potential loading of this 
product from runoff water and sediment. Runoff of this product will be reduced by avoiding 
applications when rainfall or irrigation is expected to occur within 48 hours. 
 
Non-Target Organism Advisory Statement: 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. 
 
Mixing/Loading/Application Instructions 
Care must be taken when using this product to prevent back siphoning into wells, spills, or 
improper disposal of excess pesticide, spray mixtures, or rinsates. Check valves or antisiphoning 
devices must be used on mixing equipment. This product may not be mixed/loaded or used within 
50 ft. of wells, including abandoned wells, drainage wells, and sink holes. Operations that involve 
mixing, loading, rinsing, or washing of this product into or from pesticide handling or application 
equipment or containers within 50 ft. of any well are prohibited, unless conducted on an impervious 
pad constructed to withstand the weight of the heaviest load that may be positioned on or moved 
across the pad. Such a pad shall be designed and maintained to contain any product spills or 
equipment leaks, container or equipment rinse or wash water, and rain water that may fall on the 
pad. Surface water shall not be allowed to either flow over or from the pad, which means the pad 
must be self-contained. The pad shall be sloped to facilitate material removal. An unroofed pad 
shall be of sufficient capacity to contain at a minimum 110% of the capacity of the largest pesticide 
container or application equipment on the pad. A pad that is covered by a roof of sufficient size to 
completely exclude precipitation from contact with the pad shall have a minimum containment 
capacity of 100% of the capacity of the largest pesticide container or application equipment on the 
pad. Containment capacities as described above shall be maintained at all times. The above-
specified minimum containment capacities do not apply to vehicles when delivering pesticide 
shipments to the mixing/loading site.

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Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
 
PHYSICAL AND CHEMICAL HAZARDS 
Do not use or store near heat or open flame. Do not mix or allow to come in contact with oxidizing 
agents. Hazardous chemical reaction may occur. 
 
DIRECTIONS FOR USE 
It is a violation of Federal law to use this product in a manner inconsistent with its labeling. 
 
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. For any requirements 
specific to your State or Tribe, consult the agency responsible for pesticide regulation. 
 
Endangered Species Protection Requirements: 
It is a Federal offense to use any pesticide in a manner that results in an unauthorized “take” (e.g., 
kill or otherwise harm) of an endangered species and certain threatened species, under the 
Endangered Species Act section 9. When using this product, you must follow the measures 
contained in the Endangered Species Protection Bulletin for the area in which you are applying the 
product. You must obtain a Bulletin no earlier than six months before using this product. To obtain 
Bulletins, consult http://www.epa.gov/espp/, call 1-844-447-3813, or email ESPP@epa.gov. You 
must use the Bulletin valid for the month in which you will apply the product. 
 
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 agricultural 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-entry interval (REI) of 
12 hours. 
 
For early entry to treated areas that is permitted under the Worker Protection Standard and that 
involves contact with anything that has been treated, such as plants, soil and water, wear: 
x Protective eyewear (safety glasses, goggles) 
x Coveralls 
x Chemical-resistant gloves made of barrier laminate or Viton •14 mils 
x Shoes and socks 
 
FAILURE TO FOLLOW THE DIRECTIONS FOR USE AND PRECAUTIONS ON THIS LABEL 
MAY RESULT IN POOR WEED CONTROL, CROP INJURY, OR ILLEGAL RESIDUES. 
 
Note: It is illegal to sell, use or distribute this product within, or into, Nassau County or Suffolk 
County, New York. 
 
HM-1821-A Herbicide can be used in yellow popcorn, and sweet corn for preemergence weed 
control and in field corn and seed corn for preemergence and early postemergence control of many 
annual grasses and broadleaf weeds. HM-1821-A Herbicide contains the safener benoxacor (0.19 
lb/gal). 
 
See Tables 1 and 2 for a list of weeds controlled. This product must be used prior to weed 
emergence to effectively control most grass weeds. 
 
Applied according to use directions and under normal growing conditions, HM-1821-A Herbicide 
will not harm the treated crop. During germination and early stages of growth, environmental

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Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
conditions or other factors that favor poor or slow growth can weaken crop seedlings. HM-1821-A 
Herbicide used under these conditions can result in crop injury. 
 
Use Restrictions 
1. Do not apply this product through any type of irrigation system. 
2. Do not use flood irrigation to apply or incorporate this product. 
3. Do not use aerial application to apply HM-1821-A Herbicide. 
4. Do not contaminate irrigation water used for non-labeled crops or water used for domestic 
purposes. 
5. Do not apply under conditions which favor runoff or wind erosion of soil containing this 
product to non-target areas. 
Use Precautions 
1. To prevent off-site movement due to runoff or wind erosion: 
a. Avoid treating powdery, dry, or light sandy soils when conditions are favorable for 
wind erosion. Under these conditions, the soil surface should first be settled by 
rainfall or irrigation. 
b. Do not apply to impervious substrates such as paved or highly compacted surfaces 
or frozen or snow-covered soils. 
c. Do not use tail water from the first flood or furrow irrigation of treated fields to treat 
nontarget crops, unless at least ½ inch of rainfall has occurred between application 
and the first irrigation. 
 
WEED RESISTANCE MANAGEMENT 
For resistance management, HM-1821-A Herbicide is a combination of S-metolachlor and 
Tolpyralate (Group 15 and 27 herbicides). Any weed population may contain or develop plants 
naturally resistant to HM-1821-A Herbicide and other Group 15 and 27 herbicides. The resistant 
biotypes may dominate the weed population if these herbicides are used repeatedly in the same 
field. Appropriate resistance management strategies should be followed. 
 
To delay herbicide resistance, take one or more of the following steps: 
 
x Rotate the use of HM-1821-A Herbicide or other Group 15 and 27 herbicides within a 
growing season sequence or among growing seasons with different herbicide groups that 
control the same weeds in a field. 
 
x 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. 
 
x Identify weeds present in the field through scouting and field history and understand their 
biology. The weed-control program should consider all of the weeds present. 
 
x Difficult to control weeds may require sequential applications of herbicides with differing 
mechanisms of action. 
 
x 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 seeding 
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. 
 
x Plant into weed-free fields and keep fields as weed-free as possible. 
 
x Prevent an influx of weeds into the field by managing field borders.

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Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
 
x Fields should be scouted prior to application to identify the weed species present and their 
growth stage to determine if the intended application will be effective. 
 
x Scout after herbicide application to monitor weed populations for early signs of resistance 
development. Indicators of possible herbicide resistance include: (1) failure to control a 
weed species normally controlled by the herbicide at the dose applied, especially if control 
is achieved on adjacent weeds; (2) a spreading patch of non-controlled plants of a 
particular weed species; (3) surviving plants mixed with controlled individuals of the same 
species. 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 field-to-field and within-field movement of resistant weed seeds to other 
fields by cleaning harvesting and tillage equipment when moving between fields and 
planting clean seed. 
 
x To the extent possible do not allow weed escapes to produce seeds, roots or tubers. 
Manage weed seeds at harvest and post-harvest to prevent a buildup of the weed 
seedbank. 
 
x 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, and/or use non-chemical means to remove 
escapes, as practical, with the goal of preventing further seed production. 
 
x Contact your local extension specialist or certified crop advisors for additional pesticide 
resistance-management and/or integrated weed-management recommendations for 
specific crops and weed biotypes. 
 
x For further information or to report suspected resistance, contact Helena Agri-Enterprises, 
LLC representatives at 901-761-0050 or at www.helenaagri.com. 
 
Apply this herbicide at the correct timing and rate needed to control the most difficult weed in the 
field. 
 
Use a broad-spectrum soil-applied herbicide with a mechanism of action that differs from this 
product as a foundation in a weed-control program. Do not use more than two applications of this 
or any other herbicide with the same mechanism of action within a single growing season unless 
mixed with an herbicide with another mechanism of action with an overlapping spectrum for the 
difficult-to-control weeds. 
 
To the extent possible, use a diversified approach toward weed management. Whenever possible 
incorporate multiple weed-control practices such as mechanical cultivation, biological management 
practices, and crop rotation. 
 
If resistance is suspected, treat weed escapes with an herbicide with a different MOA or use non-
chemical methods to remove escapes. 
 
Integrated Pest (Weed) 
Management 
HM-1821-A Herbicide may be integrated into an overall weed and pest management strategy. 
Practices known to reduce weed development (till- age, crop competition) and herbicide use (weed 
scouting, proper application timing, banding and rotations) should be followed wherever possible. 
Consult local agricultural and weed authorities for additional Integrated Pest Management 
strategies established for your area. 
 
Ground Application 
Spray nozzles should be uniformly spaced, the same size and type, and should provide accurate 
and uniform application. Use spray nozzles that deliver medium or coarser droplet size (ASABE

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Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
S572) to provide good coverage and avoid drift. Ensure that all in-line strainer and nozzle screens 
in the sprayer are 50-mesh or coarser. 
Always ensure that agitation is maintained until spraying is completed, even if stopped for brief 
periods of time. If the agitation is stopped for more than 5 minutes, resuspend the spray solution by 
running on full agitation prior to spraying. 
 
Preemergence Applications 
Apply HM-1821-A Herbicide preemergence with a carrier volume of 10-80 gal/A. 
 
Postemergence Applications 
Good weed coverage is essential for optimum weed control. Apply in a spray volume of 10-30 
gal/A. When weed foliage is dense, use a minimum spray volume of 20 gal/A. Flat fan nozzles are 
recommended for optimum postemergence coverage. Do not use floodjet or venturi type nozzles or 
controlled droplet application equipment for postemergence applications. Use only clean water as 
the carrier when applying HM-1821-A Herbicide after crop emergence. 
 
Aerial Application 
Do not use aerial application to apply HM-1821-A Herbicide. 
 
Chemigation Application 
Do not use chemigation application to apply HM-1821-A Herbicide. 
 
MANDATORY SPRAY DRIFT DIRECTIONS 
 
Ground Boom Applications 
x User must only apply with the release height recommended by the manufacturer, but no 
more than 3 feet above the ground or crop canopy. 
x Applicators are required to select the nozzle and pressure that deliver medium or coarse 
droplets (ASABE S572). 
x Do not apply when wind speeds exceed 10 miles per hour at the application site. 
x Do not apply during temperature inversions. 
 
Boomless Ground Applications 
x Applicators are required to select the nozzle and pressure that deliver a medium or 
coarser droplet size (ASABE S572) for all applications. 
x Do not apply when wind speeds exceed 10 miles per hour at the application site. 
x Do not appl
y during temperature inversions. 
 
Spray Drift Advisories 
THE APPLICATOR IS RESPONSIBLE FOR AVOIDING OFF-SITE SPRAY DRIFT. BE AWARE OF 
NEARBY NON-TARGET SITES AND ENVIRONMENTAL CONDITIONS. 
 
IMPORTANCE OF DROPLET SIZE 
An effective way to reduce spray drift is to apply large droplets. Use the largest droplets that 
provide target pest control. While applying larger droplets will reduce spray drift, the potential for 
drift will be greater if applications are made improperly or under unfavorable environmental 
conditions. 
 
Controlling Droplet Size – Ground Boom 
 
Volume - Increasing the spray volume so that larger droplets are produced will reduce spray drift. 
Use the highest practical spray volume for the application. If a greater spray volume is needed, 
consider using a nozzle with a higher flow rate. 
 
Pressure - Use the lowest spray pressure recommended for the nozzle to produce the target spray 
volume and droplet size.

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Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
Spray Nozzle - Use a spray nozzle that is designed for the intended application. Consider using 
nozzles designed to reduce drift. 
 
BOOM HEIGHT – Ground Boom 
For ground equipment, the boom should remain level with the crop and have minimal bounce. 
 
SHIELDED SPRAYERS 
Shielding the boom or individual nozzles can reduce spray drift. Consider using shielded sprayers. 
Verify that the shields are not interfering with the uniform deposition of the spray on the target area. 
 
TEMPERATURE AND HUMIDITY 
When making applications in hot and dry conditions, use larger droplets to reduce effects of 
evaporation. 
 
TEMPERATURE INVERSIONS 
Drift potential is high during a temperature inversion. Temperature inversions are characterized by 
increasing temperature with altitude and are common on nights with limited cloud cover and light to 
no wind. The presence of an inversion can be indicated by ground fog or 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. Avoid applications during 
temperature inversions. 
 
WIND 
Drift potential generally increases with wind speed. AVOID APPLICATIONS DURING GUSTY 
WIND CONDITIONS. 
Applicators need to be familiar with local wind patterns and terrain that could affect spray drift.” 
 
Boom-less Ground Applications 
Setting nozzles at the lowest effective height will help to reduce the potential for spray drift. 
 
Handheld Technology Applications 
Take precautions to minimize spray drift. 
 
Applications After Corn Has 
Emerged 
When applying HM-1821-A Herbicide postemergence to corn, add either a nonionic surfactant 
(NIS) or crop oil concentrate (COC). When using a NIS, add at 0.25% v/v (1 qt./100 gal.). When 
using a COC, add at a rate of 1% v/v (1 gal/100 gal.) or the equivalent of 1 gal/100 gal. The use of 
COC will provide more consistent weed control than an NIS but may also result in temporary crop 
injury. 
 
In addition to NIS or COC, a nitrogen-based adjuvant may also be added to increase consistency of 
weed control. The use of nitrogen-based adjuvants (AMS or UAN) will increase the risk of crop 
injury and can result in temporary crop injury. 
 
Do not use methylated seed oil (MSO) with HM-1821-A Herbicide when applied alone to emerged 
field corn, or when HM-1821-A Herbicide is applied as a postemergence tank mixture with other 
products. 
 
Applications Prior to Corn 
Emergence 
Any of the adjuvants may be used at a preemergence or preplant timing, i.e. where the corn crop 
has not yet emerged, to increase burndown activity on existing weeds. 
 
Either water or liquid fertilizers, excluding suspension fertilizers, may be used as carriers for 
preemergence applications. If fluid fertilizers are used, a compatibility test must be done. Even if 
HM-1821-A Herbicide is physically compatible with a fluid fertilizer, constant agitation is necessary

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Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
to maintain a uniform mixture during application. Use only clean water as the carrier when applying 
HM-1821-A Herbicide after crop emergence. 
 
The spray tank must be clean, thoroughly rinsed, and decontaminated before adding either HM-
1821-A Herbicide alone or with tank-mix partners. If water is used as the carrier, use clean water. 
 
HM-1821-A Herbicide may be tank mixed with other herbicides registered for weed control in 
field corn, sweet corn, and popcorn. Read and follow all label directions for each product. It is the 
pesticide user’s responsibility to ensure that all products are registered for the intended use. Read 
and follow the applicable restrictions, limitations, and directions for use on all product labels 
involved in the tank mixture. Users must follow the most restrictive directions for use and 
precautionary statements of each product in the tank mixture. Do not tank mix HM-1821-A 
Herbicide with any other insecticide, fungicide, fertilizer solution, or adjuvant not recommended on 
the label without testing compatibility, as poor mixing may result. It is recommended that the 
compatibility of any tank-mix combination be tested on a small scale such as a jar test before actual 
tank mixing. 
 
Use the Following Mixing Instructions for Adding HM-1821-A Herbicide to the Spray Tank 
1. Only use sprayers in good operating condition with adequate agitation. Ensure the sprayer 
is cleaned according to instructions on label of the product used prior to use of HM-1821-A 
Herbicide. 
2. Begin to fill sprayer tank or premix tank with clean water and engage agitator. Agitation 
must be continued throughout the entire mixing and spraying procedure. 
3. When the sprayer or premix tank is half full of water, begin to add the mixture components 
4. If ammonium sulfate (AMS) is used, continue agitation until completely dispersed. 
5. If a wettable powder or dry flowable formulation is used, add it slowly to the tank. Mixing 
and compatibility may be improved when a wettable powder or dry flowable is diluted with 
water before adding to the tank. Agitate during the procedure. 
6. If a flowable formulation is used, add slowly to the tank. 
7. Add HM-1821-A Herbicide slowly to the tank. 
8. Add any other liquid tank-mix products next with emulsifiable concentrates last. 
9. Add an adjuvant last, if needed. 
10. Complete filling the sprayer tank and continue agitation. 
11. Apply as soon as possible after spray mixture is prepared. Do not leave mixture in spray 
tank overnight without agitation. 
 
If HM-1821-A Herbicide is added to the spray tank via induction, compatibility may be 
compromised. If an induction tank (or similar equipment) is used, add each product separately and 
allow each to disperse into the spray tank before adding the next product. For best tank-mix 
compatibility, rinse the induction tank with water before adding each component. 
 
It is recommended that HM-1821-A Herbicide not be added to the spray tank via in-line injection. 
 
Compatibility Test 
A compatibility test is recommended before tank mixing to ensure compatibility of HM-1821-A 
Herbicide with fertilizer carriers or other pesticides. The following test assumes a spray volume of 
25 gal/A. For other spray volumes, make appropriate changes in the ingredients. 
 
Nitrogen solutions or complete liquid fertilizers, excluding suspension fertilizers, may replace all or 
part of the water in the spray. Because liquid fertilizers vary, even within the same analysis, always 
check compatibility with pesticide(s) before use. Incompatibility of tank mixtures is more common 
with mixtures of fertilizer and pesticides.

10 
Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
Compatibility Test Procedure 
1. Add 1.0 pt. of carrier (fertilizer or water) to each of two 1 qt jars with tight lids. Use the 
same source of water that will be used for the tank mix and conduct the test at the 
temperature the tank mix will be applied. 
2. To one of the jars, add ¼ tsp. or 1.2 milliliters of a compatibility agent approved for this use 
(¼ tsp. is equivalent to 2.0 pt./100 gal spray). Shake or stir gently to mix. 
3. To both jars, add the appropriate amount of pesticide(s) in their relative proportions based 
on label rates. If more than one pesticide is used, add them separately as described in the 
Mixing Procedures section of this label. After each addition, shake or stir gently to 
thoroughly mix. 
4. After adding all ingredients, put lids on and tighten, and invert each jar ten times to mix. Let 
the mixtures stand 15-30 minutes and then look for separation, large flakes, precipitates, 
gels, heavy oily film on the jar, or other signs of incompatibility. 
5. Determine if the compatibility agent is needed in the spray mixture by comparing the two 
jars. If either mixture separates, but can be remixed readily, the mixture can be sprayed as 
long as good agitation is used. If the mixtures are incompatible, test the following methods 
of improving compatibility: (a) slurry the dry pesticide(s) in water before addition, or (b) add 
half of the compatibility agent to the fertilizer or water and the other half to the emulsifiable 
concentrate or flowable pesticide before addition to the mixture. If incompatibility is still 
observed, do not use the mixture. 
After compatibility testing is complete, dispose of any pesticide wastes in accordance with the 
Storage and Disposal section in this label. 
 
Cleaning Equipment After Application 
Special attention must be given to cleaning equipment before spraying a crop other than field corn. 
Mix only as much spray solution as needed. 
 
Equipment Cleaning 
Procedure 
1. Flush tank, hoses, boom, and nozzles with clean water. 
2. Prepare a cleaning solution of 1 gal of household ammonia per 25 gal of water. Many 
commercial spray tank cleaners may be used. 
3. Use a pressure washer to clean the inside of the spray tank with this solution. Take care to 
wash all parts of the tank, including the inside top surface. If a pressure washer is not 
available, completely fill the sprayer with the cleaning solution to ensure contact of the 
cleaning solution with all internal surfaces of the tank and plumbing. Start agitation in the 
sprayer and thoroughly recirculate the cleaning solution for at least 15 minutes. All visible 
deposits must be removed from the spraying system. 
4. Flush hoses, spray lines, and nozzles for at least 1 minute with the cleaning solution. 
5. Remove boom end caps and flush dead space areas, with water, then replace caps. 
6. Dispose of rinsate from steps 1-5 in an appropriate manner, according to all local State and 
federal regulations. 
7. Repeat steps 2-6. 
8. Remove nozzles, screens, and strainers and clean separately in the ammonia solution 
after completing the above procedures. 
9. Rinse the complete spraying system with clean water. 
 
HM-1821-A Herbicide applied as directed in this label will control or suppress the weeds listed in 
Tables 1 and 2. Optimum weed control will be obtained if HM-1821-A Herbicide is applied 
according to all label directions. 
 
If a significant rainfall does not occur within 7 days after a preemergence application, weed control 
may be decreased. 
When weeds are stressed or not actively growing due to drought, heat, lack of fertility, flooding, or 
prolonged cool temperatures, postemergence control can be reduced or delayed.

11 
Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
Table 1. Weeds Controlled or Partially Controlled by Preemergence Applications of HM-
1821-A Herbicide 
 
Common Name 
 
Scientific Name 
C = Control 
PC = Partial Control 
Amaranth, Palmer Amaranthus palmeri C 
Amaranth, Powell Amaranthus powellii C 
Barnyardgrass Echinochloa crus-gall i C 
Buffalobur Solanum rostratum C 
Carpetweed Mollugo verticillata C 
Cocklebur, common Xanthium strumarium PC 
Crabgrass, large Digitaria sanguinalis C 
Crowfootgrass Dactyloctenium 
aegyptium 
C 
Cupgrass, prairie Eriochloa contracta C 
Cupgrass, 
Southwestern 
Eriochloa acuminata C 
Cupgrass, woolly Eriochloa villosa PC 
Foxtail, giant Setaria faberi C 
Foxtail, green Setaria viridis C 
Foxtail, robust 
(purple, white) 
Setaria viridis C 
Foxtail, yellow Setaria pumila C 
Galinsoga Galinsoga parviflora C 
Goosegrass Eleusine indica C 
Jimsonweed Datura stramonium C 
Johnsongrass, seedling Sorghum halepense PC 
Kochia Kochia scoparia PC 
Lambsquarters, common Chenopodium album C 
Millet, foxtail Setaria italica C 
Millet, wild proso Panicum miliaceum PC 
Morningglory, ivyleaf Ipomoea hederacea PC 
Morningglory, entireleaf Ipomoea hederacea PC 
Nightshade, black Solanum nigrum C 
Nightshade, Eastern black Solanum ptycanthum C 
Nightshade, hairy Solanum sarachoides C 
Nutsedge, yellow Cyperus esculentus C 
Panicum, browntop Panicum fasciculatum C 
Panicum, fall Panicum dichotomiflorum C 
Panicum, Texas Panicum texanum PC 
Continued...

12 
Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
 
Table 1. Weeds Controlled or Partially Controlled by Preemergence 
Applications of HM-1821-A Herbicide (continued) 
 
Common Name 
 
Scientific Name 
C = Control 
PC = Partial Control 
Pigweed, redroot Amaranthus retroflexus C 
Pigweed, smooth Amaranthus hybridus C 
Purslane, common Portulaca oleracea C 
Pusley, Florida Richardia scabra C 
Ragweed, common Ambrosia artemisiifolia PC 
Ragweed, giant Ambrosia trifida PC 
Rice, red Oryza sativa C 
Sandbur, field Cenchrus incertus PC 
Shattercane Sorghum bicolor PC 
Sida, prickly Sida spinosa PC 
Signalgrass, broadleaf Brachiaria platyphylla PC 
Smartweed, 
ladysthumb 
Polygonum persicaria C 
Smartweed, 
Pennsylvania 
Polygonum 
pensylvanicum 
C 
Sprangletop, red Leptochloa filiformis C 
Velvetleaf Abutilon theophrasti C 
Waterhemp, common Amaranthus rudis C 
Waterhemp, tall Amaranthus 
tuberculatus 
C 
Witchgrass Panicum capillare C

13 
Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
Table 2: Weeds Controlled or Partially Controlled by Early Postemergence Applications of 
HM-1821-A Herbicide 
HM-1821-A Herbicide applied early postemergence will provide control or partial control of small 
emerged broadleaf weeds (less than 3 inches) but will not provide consistent or effective control of 
weeds identified as resistant to postemergence HPPD inhibitors. 
 
 
Common Name 
 
Scientific Name 
C = Control 
PC = Partial Control 
Amaranth, Palmer Amaranthus palmeri C 
Amaranth, Powell Amaranthus powellii C 
Barnyardgrass Echinochloa crus-galli C 
Buffalobur Solanum rostratum C 
Carpetweed Mollugo verticillata C 
Cocklebur, common Xanthium strumarium C 
Cupgrass, woolly Eriochloa villosa C 
Cupgrass, prairie Eriochloa contracta C 
Cupgrass, Southwestern Eriochloa acuminata C 
Crabgrass, large Digitaria sanguinalis C 
Crowfootgrass Dactyloctenium aegyptium C 
Dandelion Taraxacum officinale PC 
Foxtail, giant Setaria faberi C 
Foxtail, green Setaria viridis C 
Foxtail, yellow Setaria pumila C 
Foxtail, millet Setaria italica C 
Galinsoga Galinsoga parviflora C 
Goosegrass Eleusine indica C 
Hemp Cannabis sativa C 
Henbit Lamium amplexicaule C 
Horsenettle Solanum carolinense C 
Horseweed (marestail) Conyza canadensis C 
Jimsonweed Datura stramonium C 
Kochia Kochia scoparia PC 
Lambsquarters, common Chenopodium album C 
Millet, wild proso Panicum miliaceum PC 
Morningglory, ivyleaf Ipomoea hederacea PC 
Morningglory, tall Ipomoea purpurea PC 
Mustard, blue Chorispora tenella C 
Mustard, wild Brassica kaber C 
Nightshade, black Solanum nugrum C 
Nightshade, Eastern black Solanum ptycanthum C 
Nightshade, hairy Solanum sarachoides C 
Nutsedge, yellow Cyperus esculentus PC 
Panicum, fall Panicum 
dichotomiflorum 
C 
Pigweed, redroot Amaranthus 
retroflexus 
C 
Continued...

14 
Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
 
Table 2: Weeds Controlled or Partially Controlled by Early Postemergence Applications of 
HM-1821-A Herbicide (continued) 
 
 
Common Name 
 
Scientific Name 
C = Control 
PC = Partial Control 
Pigweed, smooth Amaranthus hybridus C 
Pokeweed, Common Phytolacca americana C 
Potatoes, volunteer Solanum spp. C 
Purslane, common Portulaca oleracea C 
Pusley, Florida Richardia scabra C 
Ragweed, common Ambrosia artemisiifolia C 
Ragweed, giant Ambrosia trifida C 
Shattercane/volunteer sorghum Sorghum bicolor PC 
Sida, prickly Sida spinosa PC 
Smartweed, ladysthumb Polygonum persicaria C 
Smartweed, Pennsylvania Polygonum pensylvanicum C 
 Sowthistle, annual Sonchus oleraceus C 
Sunflower, volunteer Helianthus annuus C 
Sunflower, wild (common) Helianthus annuus C 
Thistle, Canada Cirsium arvense PC 
Velvetleaf Abutilon theophrasti C 
Waterhemp, common Amaranthus rudis C 
Waterhemp, tall Amaranthus tuberculatus C 
 
When HM-1821-A Herbicide is applied as directed on this label, follow the crop rotation intervals in 
Table 3. If HM-1821-A Herbicide is tank mixed with other products, follow the most restrictive 
product’s crop rotation interval. 
 
Table 3. Crop Rotational Intervals 
 
Crop Rotational Interval 1 
All corn types Anytime 
Barley, oats, rye, wheat 4.5 months 
Alfalfa, Cabbage, Bean(dry), Bean (green, including 
seed production), Bean (snap), Cucurbits, Grain 
sorghum,2 Ccotton, Ppeanuts, Pea (field and 
edible), Ppotatoes, Rice, Sunflower, and sSoybean 
and Tomatoess 
9 months 
All other rotational crops 18 months 
1 Time between HM-1821-A Herbicide application and replanting of the rotational crop 
2 Grain sorghum must be seed treated with a safener to tolerate S-metolachlor

15 
Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
CORN: Field Corn, Seed Corn, Sweet Corn and Yellow Popcorn 
Apply HM-1821-A Herbicide for preemergence control of many annual grass and broadleaf weeds 
in field corn, seed corn, sweet corn and yellow popcorn. HM-1821-A Herbicide may also be applied 
early postemergence for the control of broadleaf weeds in field corn and seed corn. Do not apply 
HM-1821-A Herbicide to yellow popcorn or sweet corn after the crop has emerged, or crop injury 
may occur. Refer to Tables 1 and 2 for a list or weeds controlled or partially controlled by HM-
1821-A Herbicide. 
 
HM-1821-A Herbicide Application Timings 
Burndown for Reduced Tillage Situations 
In reduced or no-till corn and before the crop has emerged, HM-1821-A Herbicide can be applied 
alone or in tank mixture with paraquat dichloride; diquat dibromide; glyphosate; glyphosate-
isopropylammonium; glyphosate, ammonium salt; glycine, N-(phosphonomethyl)-, diammonium 
salt; glycine, N-(phosphonomethyl)-potassium salt; nonanoic acid; dithiopyr; or other registered 
herbicides for burndown of existing weeds. Refer to Tables 1 and 2 for specific weeds controlled 
by HM-1821-A Herbicide. Read and follow all product labels for specific use directions and 
information on weeds controlled. Refer to the ADDITIVES and TANK MIX sections on this label for 
additional recommendations. 
 
Early Preplant and Preemergence 
Apply HM-1821-A Herbicide early preplant (up to 14 days prior to planting) or preemergence to field 
corn, seed corn, sweet corn, and yellow popcorn. 
 
Early Postemergence 
Apply HM-1821-A Herbicide to field or seed corn after emergence until the plants reach 20 inches 
in height or up to the V6 stage of corn growth. Target applications to corn that is less than 12 
inches tall for improved coverage and best overall performance. Use only clean water as the carrier 
when applying HM-1821-A Herbicide after crop emergence. Do not apply postemergence in liquid 
fertilizer or severe crop injury maywill occur. Do not apply HM-1821-A Herbicide to emerged yellow 
popcorn or sweet corn, or severe crop injury may occur. Refer to the ADDITIVES section on this 
label for burndown adjuvant recommendations. 
 
Timing to Weeds 
Apply HM-1821-A Herbicide when susceptible weeds are young and actively growing, but before 
they exceed 3 inches in height. Treat heavy infestations of weeds before they become too 
competitive with the crop, especially where soil moisture and/or fertility are limited. HM-1821-A 
Herbicide provides weed control via foliar and root absorption. For later-emerging weeds, a second 
application or a timely cultivation is required. Applications made to weeds larger than the size 
indicated on this label or to weeds under stress may result in unsatisfactory control. 
 
HM-1821-A Herbicide Use 
Rates 
Apply HM-1821-A Herbicide at a rate of 1.4 qt/A (1.30 lbs. S-metolachlor/A; 0.035 lb. tolpyralate/A) 
for control or partial control of the weeds listed in Tables 1 and 2.

16 
Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
Table 4. HM-1821-A Herbicide Use Rates in Corn 
 
HM-1821-A Herbicide Use Rate 
1.4 qt/A 
(1.30 lbs. S-metolachlor/A; 
0.035 lb. tolpyralate/A) 
 
Tank-Mix Combinations 
Preemergence (Applied Before the Crop has Emerged) 
Tank-mix partners listed in Table 5 may be used in conventional, reduced, or no-till systems and be 
applied by the same methods and at the same timings as HM-1821-A Herbicide unless otherwise 
specified in the tank-mix product label. It is the pesticide user’s responsibility to ensure that all 
products are registered for the intended use. Read and follow the applicable restrictions for use on 
all product labels involved in tank mixing. Users must follow the most restrictive directions for use 
and precautionary statements of each product in the tank mixture. 
 
Table 5: HM-1821-A Herbicide Tank Mixtures for 
Preemergence Applications in Corn 
 
Tank Mix1 Ob jective 
 Atrazine solo products Improved broadleaf and grass weed control 
Paraquat dichloride products Burndown existin g weeds 
Metribuzin solo products Improved broadleaf weed control 
Simazine products Improved broadleaf and grass weed control 
Glyphosate Brands Burndown existin g weeds 
2,4-D Burndown existin g weeds 
Warrior II with Zeon 
Technology® (lambda-
cyhalothrin, EPA Reg. No. 100-
1295) 
To control insects, such as cutworm 
1 Refer to tank-mix product label for use rates. 
 
Early Postemergence (Applied After the Crop has Emerged) 
Tank-mix products listed in Table 6 may be used in conventional, reduced, or no-till systems and 
be applied by the same methods and at the same timings as HM-1821-A Herbicide unless 
otherwise specified in the tank-mix product label. Follow all tank-mix product labels for use rates 
and restrictions. Perform a compatibility test. 
 
Table 6: HM-1821-A Herbicide Tank Mixtures for Postemergence Applications in Field Corn 
 
Tank Mix1,2 Ob jective 
Atrazine solo products Improved broadleaf and annual grass weed control 
Accent® Q (nicosulfuron, EPA 
Reg. No. 352-773) 
Emerged grass control 
Basis® (thifensulfuron and 
rimsulfuron, EPA Reg. No. 352-
571 and EPA Reg. No. 352-
854
) 
Emerged grass control 
Glufosinate products See instructions under “HM-1821-A Herbicide Programs in 
Glufosinate-Resistant Corn” section of this label 
NorthStar® (dicamba, sodium 
salt and primisulfuron-methyl, 
EPA Re
g. No. 100-923) 
Improved broadleaf and grass weed control 
Peak® (prosulfuron, EPA Reg. 
No. 100-763) 
Improved broadleaf and grass weed control 
Resolve® Q (thifensulfuron and 
rimsulfuron, EPA Reg. No. 352-
777) 
Emerged grass control

17 
Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
Glyphosate Brands See instructions under “HM-1821-A Herbicide Programs in 
Glyphosate Resistant Corn” section of this label 
Spirit® (primsulfuron-methyl 
and prosulfuron, EPA Reg. No. 
100-911
) 
Improved broadleaf and grass weed control 
Status® (diflufenzopyr-sodium 
and dicamba, sodium salt, EPA 
Re
g. No. 7969-242) 
Emerged broadleaf weed control 
Steadfast® Q (nisulfuron and 
rimsulfuron, EPA Reg. No. 352-
774) 
Emerged grass control 
Sultrus® (beta-cyfluthrin, EPA 
Reg. No. 5905-599) or Warrior 
II with Zeon Technology 
To control insects, such as cutworm 
1 Refer to tank-mix product label for use rates. 
2 Consult the “Additives” section of this label for recommendations when applying HM-1821-A Herbicide in tank 
mixture to emerged field corn. 
 
HM-1821-A Herbicide Programs in Glyphosate Resistant Corn 
HM-1821-A Herbicide may be applied early postemergence at 1.4 qt/A (1.30 lbs. S-metolachlor/A; 
0.035 lb. tolpyralate/A) in tank mixture with a solo glyphosate product (e.g. Touchdown® or 
Roundup® brands) that is registered for use over-the-top in glyphosate resistant field corn (e.g. 
Roundup Ready or Agrisure® GT Corn). To minimize weed competition with the crop, target the 
application of this mixture to weeds in the 1 to 2 inch range. If the glyphosate product has a built-in 
adjuvant system (i.e. the product label does not ask for additional adjuvant), only spray-grade 
ammonium sulfate (AMS) at 8.5 lbs./100 gal. or a water-conditioning agent should at least be 
added to this mixture. If the glyphosate product label calls for an additional adjuvant in addition to 
AMS, add a non-ionic surfactant (NIS) at 0.25% v/v may also be added and AMS to this spray 
mixture. Do not add urea ammonium nitrate (UAN), crop oil concentrate (COC), or methylated seed 
oil (MSO) type adjuvants to these mixtures, or crop injury may occur. Use caution if applying HM-
1821-A with methylated seed oil (MSO), MSO-containing adjuvants, or crop oil concentrates 
(COC), as crop injury may occur with some corn hybrids or during environmental conditions which 
favor crop sensitivity. Follow all directions for use and restrictions on the glyphosate product label. 
 
Alternatively, HM-1821-A Herbicide may be applied preemergence at 1.4 qt/A (1.30 lbs. S-
metolachlor/A; 0.035 lb. tolpyralate/A) as part of a two-pass weed control system when followed by 
a postemergence application of a glyphosate-based product in glyphosate resistant corn (e.g. 
Roundup Ready or Agrisure GT Corn). When used in this way, HM-1821-A Herbicide will provide 
reduced competition of the weeds listed in Table 1 for a period of 30 or more days, thus improving 
the timing, flexibility, and effectiveness of the glyphosate-based product application. Follow all 
directions for use and restrictions on the glyphosate product label. 
 
HM-1821-A Herbicide may be applied preemergence at 0.75-1.0 qt/A (0.70-0.93 lbs. S-
metolachlor/A; 0.019-0.025 lb. tolpyralate/A) as part of a two-pass weed control system when 
followed by Halex™ GT (S-metolachlor, mesotrione, and glyphosate, EPA Reg. No. 100-1282) in 
glyphosate resistant corn (e.g. Roundup Ready or Agrisure GT Corn). Apply HM-1821-A 
Herbicide at 0.75 qt/A (0.70 lbs. S-metolachlor/A; 0.019 lb. tolpyralate/A) on soils with <3% OM and 
1.0 qt/A (0.93 lbs. S-metolachlor/A; 0.025 lb. tolpyralate/A) on soils with >3% OM. Follow all 
directions for use and restrictions on each product label. 
 
HM-1821-A Herbicide Programs in 
Glufosinate-Resistant Corn 
HM-1821-A Herbicide may be applied early postemergence at 1.4 qt/A (1.30 lbs. S-metolachlor/A; 
0.035 lb. tolpyralate/A) in tank mixture with glufosinate and applied over-the-top in field corn 
designated as glufosinate-resistant. To minimize weed competition with the crop, target the 
application of this mixture to weeds in the 1 to 2 inch range. Ammonium sulfate (AMS) or a water 
conditioning agent may be added as a spray adjuvant as directed on the glufosinate label. 
However, AMS should be the only adjuvant added to this tank mixture. Do not add urea ammonium 
nitrate (UAN), crop oil concentrate (COC), non-ionic surfactants (NIS), or methylated seed oil

18 
Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
(MSO) type adjuvants to these mixtures, or crop injury may occur. Use caution if applying HM-
1821-A with non-ionic surfactant (NIS), methylated seed oil (MSO), MSO-containing adjuvants, or 
crop oil concentrates (COC), as crop injury may occur with some corn hybrids or during 
environmental conditions which favor crop sensitivity. Follow all directions for use and restrictions 
on the glufosinate product label. 
 
Alternatively, HM-1821-A Herbicide may be applied pre-emergence at 1.4 qt/A (1.30 lbs. S-
metolachlor/A; 0.035 lb. tolpyralate/A) as part of a two-pass weed control system when followed by 
a postemergence application of glufosinate in field corn designated as glufosinate-resistant. When 
used in this way, HM-1821-A Herbicide will provide reduced competition of the weeds listed in 
Table 1 for a period of 30 or more days, thus improving the timing flexibility and effectiveness of the 
glufosinate application. Follow all directions for use and restrictions on the glufosinate product 
label. 
 
Restrictions for all Corn Uses 
1. Do not apply more than 1.4 qt (1.30 lb. S-metolachlor/A; 0.035 lb. tolpyralate/A) of HM-
1821-A Herbicide per acre per application. 
2. Do not apply more than a total of 2. 80 qt (2.61.85 lbs. S-metolachlor/A; 0.0749 lb. 
tolpyralate/A) of HM-1821-A Herbicide per acre per year. 
3. Do not make more than 2 applications per year. 
4. The retreatment interval is 14 days. 
5. Do not apply HM-1821-A Herbicide to corn that is greater than 20 inches tall or corn that is 
larger than V6 stage (6 leaf collars), whichever is more restrictive. 
6. Do not graze or feed corn forage/silage from treated areas for 45 days following 
application. 
7. Do not harvest corn for forage, grain, or stover within 45 days after application of HM-1821-
A Herbicide. 
8. Do not harvest fresh market sweet corn within 35 days after application of HM-1821-A 
Herbicide. 
9. Do not make postemergence applications of HM-1821-A Herbicide in a tank mix with any 
organophosphate or carbamate insecticide, or severe corn injury may occur. 
 
Precautions for all Corn Uses 
1. HM-1821-A Herbicide applied postemergence to corn that has received an at-planting 
application of terbufos or other organophosphate insecticide can result in severe corn 
injury. Environmental conditions that favor poor or slow corn growth will increase the risk 
or severity of the corn injury. 
2. Postemergence corn applications of any organophosphate or carbamate insecticide within 
7 days before or 7 days after a HM-1821-A Herbicide application can result in severe corn 
injury. Environmental conditions that favor poor or slow corn growth will increase the risk or 
severity of the corn injury.

19 
Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
STORAGE AND DISPOSAL 
Do not contaminate water, food, or feed by storage or disposal. 
 
Pesticide Storage 
Keep container tightly closed when not in use. Do not store near seeds, fertilizers, or food stuffs. 
Can be stored at temperatures as low as -10°F. Keep away from heat and flame. 
 
Pesticide Disposal 
Open dumping is prohibited. Waste resulting from the use of this product must be disposed of on 
site or at an approved waste disposal facility. Rinse spray equipment. Pesticide wastes are 
acutely hazardous. Improper disposal of excess pesticide, spray mixture, or rinsate is a violation 
of Federal law. If these wastes cannot be disposed of as described above, contact your State 
Pesticide or Environmental Control Agency, or the Hazardous Waste Representative at the 
nearest EPA Regional Office for guidance. 
 
Container Handling [less than 5 gallons] 
Non-refillable container. Do not reuse or refill this container. Offer for recycling if available. Triple 
rinse container (or equivalent) promptly after emptying. Triple rinse as follows: Empty the 
remaining contents into application equipment or a mix tank. Drain for 10 seconds after the flow 
begins to drip. Fill the container ¼ full with water and recap. Shake for 10 seconds. Pour rinsate 
into application equipment or a mix tank or store rinsate for later use and disposal. Drain for 10 
seconds after the flow begins to drip. Repeat this procedure two more times. Then offer for 
recycling if available or puncture and dispose of in a sanitary landfill, or by incineration. 
 
Container Handling [greater than 5 gallon] 
Refillable container. Refill this container with pesticide only. Do not reuse this container for any 
other purpose. Cleaning the container before final disposal is the responsibility of the person 
disposing of the container. Cleaning before refilling is the responsibility of the person refilling. To 
clean container before final disposal, empty the remaining contents from this container into 
application equipment or mix tank. 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 
for recycling if available or puncture and dispose of in a sanitary landfill, or by incineration, or by 
other procedures approved by state and local authorities. 
 
DO NOT USE CONTAINERS FOR THE STORAGE OF FOOD, FEED, OR DRINKING WATER!

20 
Filename: HM-1821-A Herbicide (5905-641) AD 012623081126 STK 
 
CONDITIONS OF SALE - LIMITED WARRANTY AND LIMITATIONS OF LIABILITY AND 
REMEDIES 
Read the Conditions of Sale - Warranty and Limitations of Liability and Remedies before 
using this product. If the terms are not acceptable, return the product, unopened, and the 
full purchase price will be refunded. 
 
The directions on this label are believed to be reliable and must be followed carefully. Insufficient 
control of pests and/or injury to the crop to which the product is applied may result from the 
occurrence of extraordinary or unusual weather conditions or the failure to follow the label 
directions or good application practices, all of which are beyond the control of Helena Agri-
Enterprises, LLC (the "Company") or seller. In addition, failure to follow label directions may cause 
injury to crops, animals, man or the environment. The Company warrants that this product 
conforms to the chemical description on the label and is reasonably fit for the purpose referred to in 
the directions for use subject to the factors noted above which are beyond the control of the 
Company. To the extent consistent with applicable law, The Company makes no other warranties 
or representations of any kind, express or implied, concerning the product, including no implied 
warranty of merchantability or fitness for any particular purpose, and no such warranty shall be 
implied by law. 
 
The exclusive remedy against the Company for any cause of action relating to the handling or use 
of this product shall be limited to, at Helena Agri-Enterprises, LLC’s election, one of the following: 
 
1. Refund of the purchase price paid by buyer or user for product bought, or 
2. Replacement of the product used 
 
To the extent consistent with applicable law, the Company shall not be liable and any and all claims 
against the Company are waived for special, indirect, incidental, or consequential damages or 
expense of any nature, including, but not limited to, loss of profits or income. The Company and the 
seller offer this product and the buyer and user accept it, subject to the foregoing conditions of sale 
and limitation of warranty, liability and remedies. 
 
 
Agrisure®GT, Halex™ GT, NorthStar®, Peak ®, Spirit®, Touchdown®, Warrior II with Zeon Technology®, the 
ALLIANCE FRAME the SYNGENTA Logo and the PURPOSE ICON are Trademarks of a Syngenta Group 
Company 
Accent® Q, Basis ®, Resolve® Q, Steadfast® Q and Viton® trademarks of E. I. du Pont de Nemours and 
Company 
Status® trademark of BASF Corporation, Roundup® trademark of Monsanto Company 
Sultrus® and HM-1821-A Herbicide™ trademarks of Helena Holding Company