crop-chem-docs/corpus/epa_ppls/9779-347.md

# BISON

- EPA Reg No: **9779-347**
- Registrant: WINFIELD SOLUTIONS, LLC
- Signal word: Warning
- Active ingredients: MCPA, 2-ethylhexyl ester (34%); Bromoxynil octanoate (31.7%)
- Label accepted: 2022-12-21
- Source PDF: https://www3.epa.gov/pesticides/chem_search/ppls/009779-00347-20221221.pdf

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UNITED STATES ENVIRONMENTAL PROTECTION AGENCY 
 WASHINGTON, DC 20460 
 
 
 
OFFICE OF CHEMICAL SAFETY 
AND POLLUTION PREVENTION 
 
December 21, 2022 
 
Lisa Mathias 
Registration Specialist 
Winfield Solutions, LLC 
P.O. Box 64589 
St. Paul, MN 55164-0589 
 
Subject: Registration Review Label Amendments Incorporating Mitigation Measures from 
the Interim Decisions for Bromoxynil and MCPA and the National Marine 
Fisheries Services’ (NMFS) Biological Opinion on the Effects of Bromoxynil on 
Pacific Salmonids 
 Product Name: BISON 
 EPA Registration Number: 9779-347 
 Application Date: 9/7/2021 and 7/21/2022 
Decision Number: 578309, 586179, and 588885 
 
Dear Lisa Mathias: 
 
The Agency, in accordance with the Federal Insecticide, Fungicide and Rodenticide Act 
(FIFRA), as amended, has completed reviewing all the information submitted with your 
application to support the Registration Review of the above referenced product in connection 
with the Bromoxynil and MCPA Interim Decisions. The Agency has concluded that your 
submission is acceptable. 
 
This letter also addresses the label mitigation resulting from the NMFS’ Biological Opinion on 
the effects of Bromoxynil on Pacific salmonids. The Agency has concluded that your submission 
is also acceptable. The label referred to above, submitted in connection with registration under 
FIFRA, as amended, is acceptable. 
 
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 the Federal Insecticide Fungicide and Rodenticide 
Act 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) list 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.

Page 2 of 2 
EPA Reg. No. 9779-347 
Decision No. 578309, 586179, and 588885 
 
A stamped copy of your labeling 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 
CFR 152.130(c), you may distribute or sell this product under the previously approved 
labeling for 12 months from the date of this letter. After 12 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 CFR 152.3. 
 
If you have any questions about this letter, please contact Quinn Gavin at gavin.quinn@epa.gov. 
 
 Sincerely, 
 
 
 Linda Arrington, Branch Chief 
 Risk Management and Implementation Branch 4 
 Pesticide Re-Evaluation Division 
 Office of Pesticide Programs 
 
 
 
Enclosure

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BROMOXYNIL GROUP 6 HERBICIDE
MCPA GROUP 4 HERBICIDE
Bison® 
FOR CONTROL OF CERTAIN BROADLEAF WEEDS IN WHEAT, BARLEY, OATS, RYE , FLAX, 
CONSERVATION RESERVE PROGRAM (CRP) AREAS, AND GRASSES GROWN FOR SEED OR SOD
PRODUCTION
ACTIVE INGREDIENT:
 2-ethylhexyl ester of 2-methyl -chlorophenoxyacetic acid**.............................................34.0%
Octanoic acid ester of bromoxynil* (3,5-dibromo-4-hydroxybenzonitrile).......................31.7%
OTHER INGREDIENTS***:............................................................................................. 34.3%
TOTAL.............................................................................................................................100.0%
 *Bromoxynil octanoate equivalent to 21.8% of bromoxynil, or not less than 2 lbs. of bromoxynil per gal. 
**Equivalent to 21.8% 2-methyl-chlorophenoxyacetic acid, or not less than 2 lbs. MCPA acid per gal. 
***Contains Petroleum Distillate
KEEP OUT OF REACH OF CHILDREN
WARNING AVISO
Si usted no entiende la etiqueta, busque a alguien para que se la explique a usted en detalle. (If you do not 
understand the label, find someone to explain it to you in detail.)
FIRST AID
IF SWALLOWED: 
x Call a poison control center or doctor immediately for treatment advice.
x Do not give any liquid to person.
x Do not give anything by mouth to an unconscious person.
x Do not induce vomiting unless told to by a poison control center or doctor.
IF IN EYES: 
x Hold eye open and rinse slowly and gently with water for 15-20 minutes. Remove contact lenses, if present, 
after the first 5 minutes, then continue rinsing.
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.
IF INHALED:
x Move person to fresh air.
x If person is not breathing, call 911 or an ambulance, then give artificial respiration, preferably mouth-to-
mouth if possible.
x Call a poison control center or doctor for further treatment advice.
Have the product container or label with you when calling a poison control center or doctor or going for 
treatment. You may contact 1-877-424-7452 for emergency medical treatment information.
Note to Physician: The product contains petroleum distillate – vomiting may cause aspiration pneumonia.
EPA Reg. No. 9779-347 EPA Est. No. ________
Distributed by NET CONTENTS _____ GALS.
Winfield Solutions, LLC
P . O . B o x 6 4 5 8 9 , S t . P a u l , M N 5 5 1 6 4 - 0 5 8 9 L O T N O . _ _ _ _ _ _ _ _ 
2/0721/2
 
Dec 21, 2022
9779-347

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PRECAUTIONARY STATEMENTS 
 HAZARDS TO HUMANS AND DOMESTIC ANIMALS 
WARNING: May be fatal if swallowed. Causes moderate eye irritation. Avoid contact with skin, eyes or clothing. 
 Avoid breathing spray mist. 
 
Personal Protective Equipment (PPE): 
 
Mixers, loaders, applicators, flaggers and other handlers must wear: 
x Long-sleeved shirt and long pants, 
x Shoes plus socks, and 
x Chemical-resistant gloves made of barrier laminate, nitrile rubber > 14 mils, neoprene rubber > 14 mils, 
or viton > 14 mils. 
 
Additionally, mixers and loaders supporting aerial application to noncropland must also wear: 
x A chemical-resistant apron. 
 
See ENGINEERING CONTROLS for additional requirements. 
 
Discard clothing and other absorbent materials that have been drenched or heavily contaminated with this 
product's concentrate. 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. 
 
ENGINEERING CONTROLS 
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. IMPORTANT: When reduced PPE is worn 
because a closed system is being used, handlers must be provided all PPE specified above for "applicators 
and other handlers" and have such PPE immediately available for use in an emergency, such as a spill or 
equipment breakdown. 
 
Pilots must use an enclosed cockpit that meets the requirements listed in the WPS for agricultural pesticides 
[40 CFR 170.240(d)(6)]. 
 
Handlers must use closed mixing loading systems during mixing/loading liquids for aerial applications to fallow 
land and high acreage field crops (barley, flax, oats, rye, wheat, grass grown for seed). 
 
If you will handle a total of 60 gallons or more of this product per day, you must use a mechanical transfer system 
for all mixing and loading operations. However, as noted above, for aerial applications and regardless of total 
gallonage, handlers must always use closed mixing loading systems during mixing and loading liquids for 
application to fallow land and high acreage field crops (barley, flax, oats, rye, wheat, grass grown for seed). 
 
If this product is packaged in a 30 gallon drum, you must use a mechanical transfer system which terminates in a 
drip-free hard coupling which may be used only with a spray or mix tank which has been fitted with a compatible 
coupling. If you do not presently own or have access to a mechanical transfer system with this type of coupling, 
contact your dealer for information on how to obtain such a system or to modify your present system. When using 
a mechanical transfer system, do not remove or disconnect the pump or probe from the container until the 
container has been emptied and rinsed. The pump or probe system must be used to rinse the empty container 
and to transfer the rinsate directly to the mixing or spray tank. 
 
Application from a tractor with a completely enclosed cab or aerial application is required whenever this product is 
applied to 360 or more acres in a day. The closed systems and enclosed cabs must be used 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. To 
reduce exposure to residues, wash the spray rig, tractor, and all other equipment used to handle or apply this 
product with water daily or before using the equipment for any other purpose.

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 USER SAFETY RECOMMENDATIONS 
Users should wash hands before eating, drinking, chewing gum, using tobacco or using the toilet. Remove 
PPE/clothing immediately if pesticide gets inside. Remove PPE immediately after handling this product. Then 
wash thoroughly and put on clean clothing. Wash the outside of gloves before removing. 
 
 ENVIRONMENTAL HAZARDS 
This pesticide is toxic to wildlife and fish, aquatic invertebrates and aquatic plants. Use with care when applying 
to areas frequented by wildlife or adjacent to any body of water. For terrestrial uses, do not apply directly to 
water, or to areas where surface water is present or to intertidal areas below the mean high water mark. Do not 
apply when weather conditions favor drift from target areas. Do not contaminate water when disposing of 
equipment washwaters or rinsate. Drift and runoff may be hazardous to aquatic organisms in water adjacent to 
treated areas. 
 
Groundwater Advisory 
MCPA 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. 
 
Surface Water Advisory 
This product may impact surface water quality due to runoff of rain water. This is especially true for poorly 
draining soils and soils with shallow ground water. 
 
This product is classified as having high potential for reaching surface water via runoff for several months or 
more after application. 
 
A level, well-maintained vegetative buffer strip between areas to which this product is applied and surface 
water features such as ponds, streams, and springs will reduce the potential loading of MCPA 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 
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. 
 
Reporting Ecological Incidents 
To report ecological incidents, including mortality, injury, or harm to plants and animals, call 1-855-494-6343. 
 
PHYSICAL AND CHEMICAL HAZARDS 
Do not use or store near heat or open flame. 
 
NOTICE 
BISON Herbicide contains low volatile ethylhexyl ester of MCPA. At high air or ground surface temperatures, 
vapors from this product may cause injury to susceptible plants. This fact should be considered when applying 
BISON. 
 
DIRECTIONS FOR USE 
It is a violation of Federal Law to use this product in a manner inconsistent with its labeling. Read entire label 
before using this product. 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.

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 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 
intervals. 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 (including sod farms) during the restricted-entry interval 
(REI) of 24 hours, with the exception of grass. For grass, do not enter or allow worker entry into treated 
areas during the restricted-entry interval (REI) of 2 days. 
 
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, such as plants, soil, or water, is: coveralls, chemical-
resistant gloves made of barrier laminate, nitrile rubber > 14 mils, neoprene rubber > 14 mils, or viton > 14 
mils, chemical-resistant footwear plus socks, and protective eyewear. 
 
NON-AGRICULTURAL USE REQUIREMENTS 
The requirements in this box apply to the use of this product on non-residential turf grass areas that are NOT 
within the scope of the Worker Protection Standard (WPS) for agricultural pesticides (40 CFR Part 170). The 
WPS applies when this product is used to produce agricultural plants on farms, forests, nurseries, or 
greenhouses. 
 
Do not allow people or pets to enter the treated area until sprays have dried. 
 
PRODUCT INFORMATION 
BISON is formulated as an emulsifiable concentrate containing the equivalent of 2 lbs. per gallon of bromoxynil 
and 2 pounds per gallon of MCPA acid. BISON is a selective postemergence herbicide for control of important 
broadleaf weeds infesting wheat, barley, oats, rye, flax, CRP (Conservation Reserve Program) areas, and grasses 
grown for seed. Optimum weed control is obtained when BISON is applied to actively growing weed seedlings. 
BISON is primarily a contact herbicide; therefore, thorough coverage of the weed seedlings is essential for 
optimum control. 
 
BISON has little residual activity. Therefore, subsequent flushes of weeds will not be controlled by the initial 
treatment. Generally, crops that form a good canopy will help shade subsequent weed flushes. However, certain 
crops or short-straw varieties, for example, Yaccora Rojo wheat, may not develop the crop canopy fast enough to 
shade the subsequent flushes of weeds. 
 
Occasional transitory leaf burn may occur. The temporary leaf burn is similar to that seen with liquid fertilizer. 
Because the activity of BISON is mainly contact, recovery of the crop is generally rapid with no lasting effect. 
Frequency and amount of leaf burn may be greater when crops are stressed by abrasive winds, cool to cold 
evening temperatures or mechanical injury, such as that caused by hail, sleet, or insect feeding. To reduce the 
potential for temporary leaf burn, applications should be made to dry foliage in the recommended spray volumes 
per acre when weather conditions are not extreme. 
 
General Use Restrictions 
x Do not apply with backpack or hand-held application equipment. 
x Do not apply to residential, playground, school yard or golf course turf. 
x Aerial applications to fallow land is restricted within 25 feet of residential areas (e.g., homes, schools, 
playgrounds, shopping areas, hospitals, etc.).

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 MIXING, LOADING AND HANDLING INSTRUCTIONS 
 
See the ENGINEERING CONTROLS section for additional information. 
 
BISON ALONE: Fill the spray tank 1/2 to 3/4 full with clean water. Begin agitation and add the recommended 
amount of BISON. Add water to the spray tank to the desired level. Maintain sufficient agitation to ensure a 
uniform spray mixture during application. 
 
TANK MIXTURES: BISON can be applied in tank mixture with many other herbicides and insecticides 
registered for use on approved crops. 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 follow the most restrictive directions for use and 
precautionary statements of each product in the tank mixture. Refer to the specific crop section for rate 
directions and other restrictions. 
 
To apply BISON in mixture with another product, fill the spray tank 1/2 to 3/4 full with clean water and begin 
agitation. If tank mixing with wettable powder, soluble powder, flowable or dry flowable products, add the powder 
or flowable product first. After the other herbicide is thoroughly mixed with water, add the directed amount of 
BISON and add water to the spray tank to the desired level. If tank mixing with other product types, add the 
BISON first before adding the other product. Always mix one product in water thoroughly before adding another 
product or compatibility problems may occur. Never mix two products together without first mixing in water. 
 
Maintain sufficient agitation while mixing and during application to ensure a uniform spray mixture. If spray 
mixture is allowed to remain without agitation for short periods of time, be sure to agitate until uniformly mixed 
before application. 
 
If tank mixing with products other than those listed within each crop section, a compatibility test is recommended 
to ensure satisfactory spray preparation. To test for compatibility, use a small container and mix a small amount 
(0.5 to 1 quart) of spray, combining all ingredients in the same ratio as the anticipated use. If any indications of 
physical incompatibility develop, do not use this mixture for spraying. Indications of incompatibility usually will 
appear within 5 to 15 minutes after mixing. To ensure maximum crop safety 
and weed control, follow all cautions and limitations on this label and the labels of products used in the tank 
mixture with BISON . 
 
SPRAYABLE LIQUID FERTILIZERS AND SPRAY ADDITIVES 
BISON can be applied in combination with sprayable liquid fertilizer or spray additives such as surfactants or 
crop oil concentrate. When an adjuvant is to be used with this product, Winfield Solutions, LLC recommends the 
use of a Council of Producers & Distributors of Agrotechnology certified adjuvant. 
 
When tank mixing with liquid fertilizer, always add the fertilizer to the spray tank first and agitate thoroughly 
before adding BISON. Always predetermine the compatibility with liquid fertilizer by mixing small proportional 
quantities in advance. Agitation must be maintained during filling and application operations to ensure that 
BISON is evenly mixed with the fertilizer. Leaf burn may occur when BISON is applied with liquid fertilizer, but 
new leaves are not adversely affected. 
 
NOTICE: Fertilizers and spray additives can increase foliage leaf burn when applied with BISON. Do not apply 
fertilizers or spray additives with BISON if leaf burn is a major concern due to environmental conditions, crop or 
variety sensitivity to BISON. 
 
APPLICATION PROCEDURES 
BISON can be applied to registered use areas by ground, aerial and sprinkler irrigation equipment. 
 
GROUND APPLICATION 
Use a standard herbicide boom sprayer that provides uniform and accurate application. Sprayer should be 
equipped with screens no finer than 50 mesh in the nozzle tips and in-line strainers. 
 
Select a spray volume and delivery system that will ensure thorough and uniform spray coverage. Raindrop
® 
nozzles and flood nozzles are not recommended as weed control with BISON may be reduced. In general, a 
spray volume of 10 to 20 gallons per acre (GPA) is recommended for optimum spray coverage. A minimum of 5

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GPA with a minimum spray pressure of 50 psi and a maximum ground speed of 10 mph may be used with 
higher speed, low volume ground application if ground terrain, crop and weed density allow effective spray 
distribution. When using higher speed equipment, a maximum ground speed of 10 mph is suggested if field 
conditions cause excessive boom movement during application which results in poor spray coverage. 
 
Ground applications made when dry, dusty field conditions exist may provide reduced weed control in wheel 
track areas. Applications using less than 10 gallons per acre may result in reduced weed control. 
 
When weed infestations are heavy, use of higher spray volumes and spray pressure will be helpful in obtaining 
uniform weed coverage.
 When the crop is large enough to interfere with the spray pattern, drop nozzles 
should be used to obtain uniform weed coverage. If you are unsure of the infestation level or size of crop, 
consult your local extension service. 
 
See the SPRAY DRIFT MANAGEMENT section of the label for mandatory spray drift mitigation measures 
and spray drift advisories. 
 
AERIAL APPLICATION 
Unless otherwise specified on this label use a minimum spray volume of 5 gallons per acre . A minimum spray 
volume of 3 gallons per acre may be used if crop canopy and weed density allow adequate spray coverage. 
Aerial applications using less than 5 gallons of spray volume per acre may result in reduced weed control. 
 
Human flaggers are prohibited unless in an enclosed vehicle. 
 
Aerial applications to fallow land is restricted within 25 feet of residential areas (e.g., homes, schools, 
playgrounds, shopping areas, hospitals, etc.). 
 
See the SPRAY DRIFT MANAGEMENT section of the label for mandatory spray drift mitigation measures 
and spray drift advisories. 
SPRAY DRIFT MANAGEMENT 
Avoiding spray drift at the application site is the responsibility of the applicator. The interaction of many 
equipment-and-weather-related factors determine the poten tial for spray drift. The applicator and the grower 
are responsible for considering all these factors when making decisions. 
 
Where states have more stringent regulations, they should be observed. 
 
MANDATORY SPRAY DRIFT MANAGEMENT 
 
Aerial Applications: 
x Do not release spray at a height greater than 10 ft above the ground or vegetative canopy, unless 
a greater application height is necessary for pilot safety. 
x Applicators must use ½ swath displacement upwind at the downwind edge of the field. 
x Do not apply when wind speeds exceed 10 miles per hour at the application site. 
x Applicators are required to select a nozzle and pressure that delivers a medium or coarser droplet 
size (ASABE S572 and S641). 
x The distance of the outer most nozzles on the boom must not exceed 75% of the length of the 
wingspan or 90% of the rotor diameter 
x Do not apply during temperature inversions. 
Ground Boom Applications: 
x User must only apply with the release height recommended by the manufacturer, but no more 
than 4 feet above the ground or crop canopy. 
x Applicators are required to select a nozzle and pressure that delivers a medium or coarser droplet 
size (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 a nozzle and pressure that delivers a medium or coarser droplet 
 Size (ASABE S572). 
x Do not apply when wind speeds exceed 10 miles per hour at the application site. 
x Do not appl y during temperature inversions.

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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 
x 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. 
x Pressure - Use the lowest spray pressure recommended for the nozzle to produce the target spray 
volume and droplet size. 
x Spray Nozzle - Use a spray nozzle that is designed for the intended application. Consider using 
 nozzles designed to reduce drift. 
 
Controlling Droplet Size – Aircraft 
x Adjust Nozzles - Follow nozzle manufacturers’ recommendations for setting up nozzles. Generally, 
to reduce fine droplets, nozzles should be oriented parallel with the airflow in flight. 
 
Boom Height – Ground Boom 
For ground equipment, the boom should remain level with the crop and have minimal bounce. 
 
Release Height - Aircraft 
Higher release heights increase the potential for spray drift. 
 
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. 
 
Boomless Ground Applications 
Setting nozzles at the lowest effective height will help to reduce the potential for spray drift . 
 
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 a 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. 
 
Wind 
Drift potential generally increases with wind speed. Applicators need to be familiar with local wind patterns 
and terrain that could affect spray drift. 
 
Sensitive Areas 
The pesticide must only be applied when the potential for drift to adjacent sensitive areas (e.g. residential 
areas, bodies of water, known habitat for threatened or endangered species, non-target crops) is minimal 
(e.g. when wind is blowing away from the sensitive areas).

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SPRINKLER IRRIGATION APPLICATION 
BISON Herbicide can be applied through sprinkler irrigation systems to small grains (wheat, barley, oats and 
rye) and grasses grown for seed or sod. 
 
Important: Apply BISON Herbicide through fixed pipe, overhead sprink ler, or hand-moved pipe irrigation 
systems only. If hand moved pipe is used for chemigation, the pipe must not be handled in any way until 24 
hours after chemigation has been completed and residues have been flushed from the system. When applying 
by chemigation, no person may enter the application site unless in an enclosed vehicle. Do not apply this 
product through any other type of irrigation system. 
 
SPECIFIC REQUIREMENTS FOR APPLICATION THROUGH AUTOMATED SPRINKLER IRRIGATION 
SYSTEM 
1. The system must contain a functional check valve, vacuum relief valve, and low pressure drain 
appropriately located on the irrigation pipeline to prevent water source contamination from backflow. 
2. The pesticide injection pipeline must contain a functional, automatic, quick-closing check valve to 
prevent the flow of fluid back toward the injection pump. 
3. The pesticide injection pipeline must also contain a functional, normally closed, solenoid-operated 
valve located on the intake side of the injection pump and connected to the system interlock to prevent 
fluid from being withdrawn from the supply tank when the irrigation system is either automatically or 
manually shut down. 
4. The system must contain functional interlocking controls to automatically shut off the pesticide injection 
pump when the water pump motor stops. 
5. The irrigation line or water pump must include a functional pressure switch which will stop the water 
pump motor when the water pressure decreases to the point where pesticide distribution is adversely 
affected. 
6. Systems must use a metering pump, such as a positive displacement injection pump (e.g., diaphragm 
pump) effectively designed and constructed of materials that are compatible with pesticides and 
capable of being fitted with a system interlock. 
7. Do not apply when wind speed favors drift beyond the area intended for treatment. 
8. Agitation is recommended in the pesticide supply tank when applying the BISON Herbicide. 
9. BISON Herbicide should be applied continuously for the duration of the water application with center 
pivot and continuous lateral move systems. Application of BISON Herbicide should be made during the 
last 30-45 minutes of the irrigation set with other overhead sprinkler systems. 
10. For best performance, set the sprinkler system to deliver approximately 0.5 inch or less of water per 
acre. 
11. Remove scale, pesticide residues and other foreign matter from the supply tank and entire injector 
system. Flush with clean water. 
12. If BISON Herbicide is diluted in the supply tank, fill the tank with half of the water amount desired, add 
the BISON and then add remaining water amount with agitation. Always dilute with at least 4 parts 
water to 1 part BISON. 
13. Start the sprinklers and then inject BISON Herbicide into the irrigation line. BISON should be injected 
with a positive displacement pump into the main line at least 8 feet ahead of a right angle turn to insure 
adequate mixing. Refer to the BISON Herbicide label for detailed information on application rates and 
timings. 
 
CHEMIGATION USER PRECAUTIONS 
Application of more than 0.5 inch/acre of irrigation water may result in decreased product performance on 
certain soils. 
 
Do not apply when conditions favor drift, when system co nnections or fittings leak , or when nozzles do not 
provide uniform distribution. 
 
Allow sufficient time for pesticide to be flushed through all the lines and nozzles before turning off irrigation 
water. 
 
Crop injury, lack of effectiveness, or illegal pesticide residues in the crop can result from non-uniform 
distribution of treated water. 
 
Do not connect an irrigation system used for pesticide application to a public water system.

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If you have questions about calibration, you should contact State Extension Service specialists, equipment 
manufacturers or other experts. 
 
A person knowledgeable of the chemigation system and responsible for its operations, or under the supervision 
of the responsible person, shall shut the system down and make necessary adjustments should the need arise. 
 
WEED LIST 
Postemergence application of BISON Herbicide will control the following weeds when sprayed in the seedling 
stage. Maximum weed stage of growth is listed under BISON DIRECTIONS. 
 
MOST SUSCEPTIBLE BROADLEAF WEED SPECIES 
Annual sowthistle 
Black mustard 
Black nightshade 
Common cocklebur 
Common lambsquarters 
Common tarweed 
Cow cockle 
Cutleaf nightshade 
Eastern black nightshade 
Coast fiddleneck 
Field pennycress 
Green smartweed 
Hairy nightshade 
Horned Poppy 
Jimsonweed 
Ladysthumb 
Lanceleaf sage 
London rocket 
Marshelder 
Pennsylvania smartweed 
Pepperweed spp. 
Redroot pigweed 
Russian thistle 
Shepherdspurse 
Silverleaf nightshade 
Smooth pigweed 
Spiny pigweed 
1Sunflower 
Tall Waterhemp 
Tartary buckwheat 
Tumble mustard 
Wild buckwheat 
Wild mustard 
Yellow rocket 
(Sonchus oleraceus) 
(Brassica nigra) 
(Solanum nigrum) 
(Xanthium strumarium) 
(Chenopodium album) 
(Hemizonia congesta) 
(Saponaria vaccaria) 
(Solanum triflorum) 
(Solanum ptycanthum) 
(Amsinckia intermedia) 
(Thlaspi arvense) 
(Polygonum scabrum) 
(Solanum sarachoides) 
(Glaucium corniculatum) 
(Datura stramonium) 
(Polygonum persicaria) 
(Salvia reflexa) 
(Sisymbrium irio) 
(Iva xanthifolia) 
(Polygonum strumarium) 
(Lepidium app.) 
(Amaranthus retroflexus) 
(Salsola kali) 
(Capsella bursa-pastoris) 
(Solanum elaeagnifolium) 
(Amaranthus hybridus) 
(Amaranthus spinosus) 
(Helianthus annuus) 
(Amaranthus tuberculatus) 
(Fagopyrum tataricum) 
(Sisymbrium altissimum) 
(Polygonum convolvulus) 
(Brassica kaber) 
(Barbarea vulgaris) 
1For control of sunflower, delay application until first sunflower seedlings 
emerging are 4 inches in height. 
 
SUSCEPTIBLE BROADLEAF WEED SPECIES 
Blue (purple) mustard 
Common groundsel 
Common ragweed 
Corn chamomile 
Corn gromwell 
Fumitory 
Giant ragweed 
Hemp sesbania 
Henbit 
Ivyleaf morningglory 
(Chlorispora tenella) 
(Senecio vulgaris) 
(Ambrosia artemisiifolia) 
(Anthemis arvensis) 
(Lithospermum arvense) 
(Fumaria officinalis) 
(Ambrosia trifida) 
(Sesbania exaltata) 
(Lamium amplexicaule) 
(Ipomoea hederacea)

10 of 17 
 
Knawel 
Kochia 
Mayweed 
Prostrate knotweed 
Puncture vine 
Tall morningglory 
Tansy mustard 
Tarweed 
Velvetleaf 
Volunteer Canola 
Wild radish 
(Scleranthus annuus) 
(Kochia scoparia) 
(Anthemis cotula) 
(Polygonum aviculare) 
(Tribulus terrestis) 
(Ipomoea purpurea) 
(Descurainia pinnata) 
(Hemizonia spp.) 
(Abutilon theophrasti) 
(Brassica napus) 
(Raphanus raphanistrum) 
Weeds germinating after spraying will not be controlled. 
 
 WEED SUPPRESSION 
Canada thistle (Cirsium arvense) 
BISON Herbicide applied at 1 1/2 pints per acre provides burn down of 
top growth. Regrowth may occur. Make applications when Canada 
thistle is 8 inches tall to the bud stage. 
 
WEED RESISTANCE MANAGEMENT 
Bison contains both a Group 4 herbicide (MCPA) and a Group 6 herbicide (Bromoxynil). Any weed 
population may contain plants naturally resistant to Group 4 and/or Group 6 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 this product or other Group 4 and Group 6 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 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 Scout fields prior to application to identify the weed species present and their growth stage to 
determine if the intended application will be effective. 
x Scout fields after herbicide application to monitor weed populations for early signs of resistance 
development. Indicators of possible herbicide resistance include: 
o Failure to control a weed species normally controlled by the herbicide at the dose applied, 
especially if control is achieved on adjacent weeds. 
o A spreading patch of non-controlled plants of a particular weed species. 
o 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 
movement of resistant weed seeds to other fields by cleaning harvesting and tillage equipment when 
moving between fields, and planting clean seed. 
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.

11 of 17 
 
x Contact your local extension specialist, certified crop advisors, and/or Winfield Solutions, LLC 
representative for pesticide resistance management and/or integrated weed management 
recommendations for specific crops and resistant weed biotypes. 
x For further information or to report suspected resistance, contact your Winfield Solutions, LLC 
representative. 
 
WHEAT, BARLEY, OATS AND RYE 
BISON DIRECTIONS 
 
PRODUCT 
APPLICATION TIMING AND SPECIFIC COMMENTS 
RATE CROP WEEDS 
BISON 1 pint/A Fall seeded wheat, barley, oats 
and rye throughout the United 
States. 
 
Apply to wheat, barley, oats 
and rye from the 3 leaf stage 
but before the crop reaches the 
boot stage and weeds are in 
growth stages specified under 
WEEDS.
 
MOST SUSCEPTIBLE BROADLEAF 
WEEDS 
Apply to weeds up to their 8 leaf stage or 
4 inches in height, whichever comes first. 
If weed forms rosette, apply before 
weeds exceed 2 inches in diameter. 
1 1/2 – 2 pints/A SUSCEPTIBLE BROADLEAF WEEDS 
Apply to weeds up to the 4 leaf stage or 
2 inches in height, whichever comes first. 
If weed forms rosette, apply before 
weeds exceed 1 inch in diameter. 
2 pints/A Apply to HENBIT, KNAWEL and 
MAYWEED up to the 4 leaf stage or 2 
inches in height, whichever comes first. 
Apply to KOCHIA and TANSY 
MUSTARD for improved control when 
these weeds exceed the recommended 
stage of growth or are growing under 
cool, dry conditions. 
1 - 1 1/2 pints/A Spring seeded wheat and 
barley except in Idaho, Oregon, 
Washington, Colorado, 
Wyoming and Montana. 
 
Apply to wheat, barley, oats 
and rye from the 3 leaf stage 
but before the crop reaches the 
boot stage and when weeds 
are in growth stages specified 
under WEEDS.
 
MOST SUSCEPTIBLE AND 
SUSCEPTIBLE BROADLEAF WEEDS 
Apply to weeds that do not exceed the 8 
leaf stage or 4 inches in height, 
whichever comes first. If weed forms 
rosette, apply before weeds exceed 2 
inches in diameter. Apply to KOCHIA up 
to 2 inches in height 
1 1/2 – 2 pints/A Apply to KOCHIA that is 2-4 inches in 
height. 
1 pint/A Spring seeded wheat, barley, 
oats and rye in Idaho, Oregon, 
Washington, Colorado, 
Wyoming and Montana. 
 
Apply to wheat, barley, oats 
and rye from the 3 leaf stage 
but before the crop reaches the 
boot stage and weeds are in 
growth stages specified under 
WEEDS.
 
MOST SUSCEPTIBLE BROADLEAF 
WEEDS 
Apply to weeds up to the 8 leaf stage or 
4 inches in height, whichever comes first. 
If weed forms rosette, apply before 
weeds exceed 2 inches in diameter. 
1 1/2 – 2 pints/A SUSCEPTIBLE BROADLEAF WEEDS 
Apply to weeds up to the 4 leaf stage or 
2 inches in height, whichever comes first. 
If weed forms rosette, apply before 
weeds exceed 1 inch in diameter.

12 of 17 
 
2 pints/A Apply to HENBIT, KNAWEL and 
MAYWEED up to the 4 leaf stage or 2 
inches in height, whichever comes first. 
Apply to KOCHIA and TANSY 
MUSTARD for improved control when 
these weeds exceed the recommended 
stage of growth or are growing under 
cool, dry conditions. 
 Post-harvest 
 
3/4 - 2 pints/A 
Make applications following 
harvest of wheat, barley, oats 
and rye in the states of North 
Dakota, South Dakota, 
Minnesota, and Montana. Do 
not plant any rotational crop 
until the following use season. 
Apply 3/4 to 1 pint/A to MOST 
SUSCEPTIBLE BROADLEAF WEEDS 
up to the 8 leaf stage or 4 inches in 
height, whichever comes first. Apply 1 
1/2 to 2 pints/A to SUSCEPTIBLE 
BROADLEAF WEEDS up to the 4 leaf 
stage or 2 inches in height, whichever 
comes first. For control of both grasses 
and broadleaf weeds, tank mix Bison 
with Roundup® or Roundup + 2,4-D 
such as Weedone® or Weedar® brand 
herbicides. 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 
follow the most restrictive directions for 
use and precautionary statements of 
each product in the tank mixture. 
 
WHEAT, BARLEY, OATS AND RYE 
BISON TANK MIXTURE DIRECTIONS 
PRODUCT RATE 
APPLICATION TIMING AND SPECIFIC COMMENTS 
CROP WEEDS 
BISON 
+ 
MCPE Phenoxy 
Herbicide 
*See Tank Mix 
Precaution 
below. 
3/4 - 2 pints/A 
+ 
1/4 - 1/2 pint/A 
Apply to spring seeded wheat, 
barley, oats and rye from tillering 
stage, but before boot stage. 
For control of MOST SUSCEPTIBLE and 
SUSCEPTIBLE weeds and improved control 
of redroot pigweed and kochia. Apply to 
weeds up to the 8 leaf stage, 3 inches in 
height or 2 inches in diameter, whichever 
comes first. Apply to kochia and redroot 
pigweed up to 2 inches in height or diameter. 
BISON 
+ 
Glean® 
+ 
nonionic 
surfactant 
*See Tank Mix 
Precaution 
below. 
3/4 - 1 1/2 
pints/A 
 + 
1/6 - 1/3 oz/A 
+ 
1 qt/100 gal 
of water 
Apply to wheat and barley from 
the 3-leaf stage but before the 
crop reaches the boot stage. 
Refer to Glean label for crop 
rotation and other restrictions. 
This tank mix improves control of broadleaf 
weeds such as henbit, tansy mustard and 
chickweed. Apply to weeds up to the 8 leaf 
stage, 4 inches in height or 2 inches in 
diameter, whichever comes first. 
BISON 
+ 
Finesse® 
+ 
nonionic 
surfactant 
3/4 - 1 1/2 
pints/A 
+ 
1/6 - 1/3 oz/A 
+ 
1 qt/100 gal 
Apply to wheat and barley from 
the 3-leaf stage but before the 
crop reaches the boot stage. 
Refer to Finesse label for crop 
rotation and other restrictions. 
This tank mix improves control of broadleaf 
weeds such as henbit, tansy mustard and 
chickweed. Apply to weeds up to the 8 leaf 
stage, 4 inches in height or 2 inches in 
diameter, whichever comes first.

13 of 17 
 
*See Tank Mix 
Precaution 
below. 
of water 
BISON 
+ 
Ally® 
+ 
nonionic 
surfactant 
*See Tank Mix 
Precaution 
below. 
3/4 - 1 1/2 
pints/A 
+ 
1/10 oz/A 
+ 
1 qt/100 gal 
of water 
Apply to wheat and barley from 
the 3-leaf stage but before the 
crop reaches the boot stage. 
Refer to Ally label for crop 
rotation and other restrictions. 
This tank mix improves control of broadleaf 
weeds such as henbit, tansy mustard and 
chickweed. Apply to weeds up to the 8 leaf 
stage, 4 inches in height or 2 inches in 
diameter, whichever comes first. 
BISON 
+ 
Harmony® Extra 
+ 
nonionic 
surfactant 
*See Tank Mix 
Precaution 
below. 
3/4 - 1 1/2 
pints/A 
+ 
3/10 – 1/2 oz/A 
+ 
1 qt/100 gal 
of water 
Winter wheat. Apply from the 3 
leaf stage but before the 3rd node 
is detectable. Refer to the 
Harmony Extra label for crop 
rotation and other restrictions. 
Spring wheat and barley. Apply 
after the 3 leaf stage but before 
the 1st node is detectable. Refer 
to the Harmony Extra label for 
crop rotation and other 
restrictions. 
 
 
 
 
This tank mix improves control of broadleaf 
weeds such as henbit, chickweed and redroot 
pigweed. Apply to weeds up to the 8 leaf 
stage, 4 inches in height or across, whichever 
comes first. 
BISON 
+ 
Amber® 
+ 
nonionic 
surfactant 
*See Tank Mix 
Precaution 
below. 
3/4 - 1 1/2 
pints/A 
+ 
0.28 - 0.56 
oz/A 
+ 
0.25% v/v 
Apply to wheat and barley from 
the 3 leaf stage, but before the 
flag leaf is visible. Refer to the 
Amber label for crop rotation and 
other restrictions. 
This tank mix improves control of broadleaves 
such as henbit, tansy mustard, and pigweed. 
Apply to weeds up to the 4 leaf stage, 4 
inches in height or 2 inches in diameter, 
whichever comes first. 
BISON 
+ 
Express® 
+ 
nonionic 
surfactant 
*See Tank Mix 
Precaution 
below. 
3/4 - 1 1/2 
pints/A 
+ 
1/6 - 1/3 oz/A 
+ 
1 qt/100 gal 
of water 
Wheat and barley. Apply from the 
3 leaf stage but before the flag is 
visible. Refer to the Express label 
for crop rotation and other 
restrictions. 
This tank mix improves control of broadleaf 
weeds such as henbit, chickweed, redroot 
pigweed and suppression of Canada thistle. 
Apply to annual weeds up to the 8 leaf stage, 
4 inches in height or across, whichever comes 
first, and to Canada thistle 4 to 8 inches tall 
with 2 to 6 inches of new growth. 
BISON 
+ 
Curtail® or 
Curtail M 
*See Tank Mix 
Precaution 
below. 
3/4 - 1 1/2 
pints/A 
+ 
2 pints/A 
Apply to wheat and barley after 
the crop begins to tiller up to the 
1st node detectable. 
This tank mix improves control of kochia, wild 
buckwheat and suppression of Canada thistle. 
Apply to annual broadleaf weeds up to the 8 
leaf stage, 4 inches in height or 2 inches in 
diameter and to Canada thistle in the rosette 
to prebud stage. 
BISON 
+ 
metribuzin 
(Dimetric® DF 
1 pint/A 
+ 
1/8 - 3/16 
pints/A 
Winter wheat in Idaho, Oregon 
and Washington. Apply in spring 
after growth has started and 
secondary roots with a minimum 
This tank mix improves control of broadleaf 
weeds such as chickweed, filaree, henbit. 
Apply to weeds up to the 4 leaf stage, 2 
inches in height or diameter, whichever

14 of 17 
 
75% or 
Sencor®) 
*See Tank Mix 
Precaution 
below. 
of 3 to 4 tillers have been 
established, but before the 
forming of joints in the stem. 
Avoid application when crop has 
experienced winter kill, frost 
damage, disease or drought. 
comes first. A recognized authority should be 
consulted concerning the use of this mixture 
in your area. 
BISON 
+ 
Assert® 
*See Tank Mix 
Precaution 
below. 
1 - 1 1/2 
pints/A 
+ 
1- 1 1/2 pints/A 
Apply to wheat and barley from 
the 3 leaf stage but before boot 
stage. Refer to Assert label for 
crop rotation and other 
restrictions. 
This tank mix will provide wild oat control in 
addition to broadleaf weeds. Apply to wild 
oats at the 1-4 leaf stage and broadleaf 
weeds up to the 8 leaf stage, 4 inches in 
height or 2 inches in diameter, whichever 
comes first. Use Assert at 1 1/2 pints/A west 
of the Rocky Mountains or if wild oats have 
initiated tillering. For spray volumes in excess 
of 10 GPA, add 0.3 fluid oz of nonionic 
surfactant for each gallon in excess of 10 
GPA. 
 
RESTRICTIONS: WHEAT, BARLEY, OATS AND RYE 
x Do not graze treated fields within 45 days after application. 
x Do not apply when crops are under moisture stress. 
x Do not apply when crop canopy covers the weeds as poor control will result. 
x Reduced weed control may occur when weeds are stressed from lack of moisture or cold temperatures. 
x Refer to labels of products used in tank mixture for additional restrictions and precautions. 
x Do not apply more than 2 pts. of this product (0.5 lb bromoxynil and 0.5 lb MCPA acid) per acre per year. 
x Do not apply more than 0.5 lb of bromoxynil per acre per year or 0.75 lb. of MCPA acid equivalent per acre per year 
when applying alone or tank mixing with other products that contain MCPA or bromoxynil. 
x Apply up to boot stage. 
x Plantback Interval 30 days after the last application, wheat, barley, oats, and rye treated with MCPA may be 
replanted with any crop specified on an MCPA label or any crop for which a residue tolerance exists for MCPA. For 
crops not listed on an MCPA label, or on crops for which no residue tolerances for MCPA have been established, a 60 
day plantback interval must be observed. 
 
TANK MIX PRECAUTION: 
x 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 follow the most restrictive directions for use and precautionary statements of each product in the tank 
mixture. 
 
FLAX (Linum usitatissimum only) 
BISON DIRECTIONS 
 APPLICATION TIMING AND SPECIFIC COMMENTS 
PRODUCT RATE CROP WEEDS 
BISON 0.9 pint/A Apply to flax that is 2 to 8 inches 
in height. Do not apply Bison to 
flax during or after the bud stage. 
Apply to MOST SUSCEPTIBLE weeds that do not 
exceed the 4 leaf stage, 2 inches in height or 1 inch 
in diameter, whichever comes first. 
 
RESTRICTIONS: FLAX (Linum usitatissimum only) 
x Do not apply if temperatures are expected to exceed 85 qF at or 3 days following application or crop injury may occur. 
x Unacceptable crop injury may occur following Bison application to flax grown on high organic, peat- type soils. 
x Application under high humidity conditions can injure flax. 
x Unless otherwise instructed, do not apply Bison with crop oil concentrate, surfactants or nitrogen solutions. 
x Do not use on ornamental flax. 
x Do not apply more than 1 pt. of this product (0.25 lb bromoxynil and 0.25 lb MCPA acid) per acre per year. 
x Plantback Interval: 30 days after the last application, flax treated with MCPA may be replanted with any crop 
specified on an MCPA label or any crop for which a residue tolerance exists for MCPA. For crops not listed on an

15 of 17 
 
MCPA label, or on crops for which no residue tolerances for MCPA have been established, a 60 day plantback interval 
must be observed. 
 
CONSERVATION RESERVE PROGRAM AREAS (CRP) 
BISON DIRECTIONS 
 APPLICATION TIMING AND SPECIFIC COMMENTS 
PRODUCT RATE CROP WEEDS 
BISON 1 - 2 pints/A Apply to grasses from the 3 leaf 
stage 
Apply 1 pint/ A to MOST SUSCEPTIBLE and 1 1/2 - 
2 pints/ A to SUSCEPTIBLE broadleaf weeds up to 
the 8-leaf stage, 4 inches in height or 2 inches in 
diameter, whichever comes first. 
 
RESTRICTIONS: CRP AREAS 
x Do not allow livestock to graze in treated areas or feed grass to livestock. 
x If legumes are included in CRP area planting, severe injury to the legumes could result from treatment with Bison. 
x Do not apply more than 2 pts. of this product (0.5 lb bromoxynil and 0.5 lb MCPA acid) per acre per year. 
x Do not apply more than 2 applications per year at the low rate (1 pt/A), with a minimum retreatment interval of 21 days, 
or 1 application per year at the high rate (2 pts/A). 
x Do not apply more than 0.5 lb bromoxynil per acre per year or 1.5 lbs. acid equivalent MCPA per acre per year when 
applying alone or tank mixing with other products that contain bromoxynil or MCPA. 
 
 
GRASSES GROWN FOR SEED OR SOD PRODUCTION 
BISON DIRECTIONS 
Seedling and Established Grasses 
 APPLICATION TIMING AND SPECIFIC COMMENTS 
PRODUCT RATE/A 
RATE/1000 
sq. ft CROP WEEDS 
BISON 
 
1 - 2 pints/A 0.375 - 0.75 
fl. oz. 
Apply to established and newly 
seeded grasses grown for seed or 
sod production before the boot 
stage. 
Established grasses tolerant to 
Bison include bentgrasses, 
Kentucky bluegrass, fescues, 
ryegrasses, Bermuda grass, St. 
Augustine grass and zoysiagrass. 
Bison may also be used on 
seedling grasses such as Merion, 
Park, Delta, or common Kentucky 
bluegrasses, Pennlawn, chewings, 
Illahee, or Alta fescues, orchard 
grass, Highland, Seaside, or 
Astoria bentgrasses, perennial 
ryegrasses, Bahiagrass and 
zoysiagrass. 
Refer to the WEED LIST for a 
listing of susceptible broadleaf 
weeds. 
Optimal control will be obtained 
when weeds are treated in the 
seedling stage (less than 4 leaf 
stage, 2 inches in height, or 1 inch 
in diameter.

16 of 17 
 
Chemigation 
2 pints/A 0.75 fl. oz. Apply to established and newly 
seeded grasses grown for seed or 
sod production before the boot 
stage. Apply through automated 
sprinkler irrigation systems with 
mechanical transfer loading system 
only. See the SPRINKLER 
IRRIGATION APPLICATION 
section for complete details. 
Established grasses tolerant to 
Bison include bentgrasses, 
Kentucky bluegrass, fescues, 
ryegrasses, Bermuda grass, St. 
Augustine grass and zoysiagrass. 
Bison may also be used on 
seedling grasses such as Merion, 
Park, Delta, or common Kentucky 
bluegrasses, Pennlawn, chewings, 
Illahee, or Alta fescues, orchard 
grass, Highland, Seaside, or 
Astoria bentgrasses, perennial 
ryegrasses, Bahiagrass and 
zoysiagrass. 
 
RESTRICTIONS: Grasses grown for seed or sod production 
x Do not allow livestock to graze in treated areas or feed treated grasses to livestock. 
x Do not apply Bison to grasses grown for seed or sod production with backpack or hand-held equipment. 
x Do not apply more than 2 pts. of this product (0.5 lb bromoxynil and 0.5 lb MCPA acid) per acre per year. 
x Do not apply more than 2 applications per year at the low rate (1 pt/A), with a minimum retreatment interval of 21 days, 
or 1 application per year at the high rate (2 pts/A). 
x Do not apply more than 0.5 lb bromoxynil per acre per year or 1.5 lbs acid equivalent MCPA per acre per year 
when applying alone or tank mixing with other products that contain MCPA or bromoxynil. 
x For crops on this label or crops with an established MCPA tolerance there is a 30 day PBI. For all other crops there is 
a 60 day PBI. 
 
STORAGE AND DISPOSAL 
Pesticide Storage: Do not contaminate water, food or feed by storage or disposal. Store at temperatures above 
3oF. If allowed to freeze, remix before using. 
Pesticide Disposal: Wastes resulting from the use of this product may be disposed of on site or at an approved 
waste disposal facility. 
Container Handling: Use label language appropriate for container size and type. 
Nonrefillable containers. Do not reuse or refill this container. Clean container promptly after emptying. 
Nonrefillable container equal to or less than 5 gallons. 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 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 or disposal. Drain for 10 seconds after the flow begins to drip. Repeat this procedure two more 
times. Then offer for recycling or reconditioning, or puncture and dispose of in a sanitary landfill, or by incineration, 
or, if allowed by state and local authorities, by burning. If burned, stay out of smoke. 
Nonrefillable container greater than 5 gallons. Triple rinse as follows: Empty the remaining contents into 
application equipment or a mix tank. Fill the container ¼ full with water. Replace and tighten closures. Tip 
container on its side and roll it back and forth, ensuring at least one complete revolution, for 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 later use or 
disposal. Repeat this procedure two more times. Then offer for recycling or reconditioning, or puncture and dispose 
of in a sanitary landfill, or by incineration, or if allowed by state and local authorities, by burning. If burned, stay out 
of smoke. 
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 refiller. To clean the container before final disposal, empty the remaining

17 of 17 
 
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. Re peat this rinsing pr ocedure two more times. T hen offer for recycling or 
reconditioning, or puncture and dispose of in a sanitary landfill, or by incineration, or, if allowed by state and local 
authorities, by burning. If burned, stay out of smoke. 
 
FOR CHEMICAL EMERGENCY: Spill, leak, fire, exposure, or accident, call 
CHEMTREC 1-800-424-9300 
 
WARRANTY DISCLAIMER 
The directions for use of this product must be followed carefully. TO THE EXTENT CONSISTENT WITH APPLICABLE 
LAW, (1) THE GOODS DELIVERED TO YOU ARE FURNISHED “AS IS” BY MANUFACTURER OR SELLER AND (2) 
MANUFACTURER AND SELLER MAKE NO WARRANTIES, GUARANTEES, OR REPRESENTATIONS OF ANY 
KIND TO BUYER OR USER, EITHER EXPRESS OR IMPLIED, OR BY USAGE OF TRADE, STATUTORY OR 
OTHERWISE, WITH REGARD TO THE PRODUCT SOLD, INCLUDING, BUT NOT LIMITED TO 
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, USE, OR ELIGIBILITY OF THE PRODUCT FOR 
ANY PARTICULAR TRADE USAGE. UNINTENDED CONSEQUENCES, INCLUDING BUT NOT LIMITED TO 
INEFFECTIVENESS, MAY RESULT BECAUSE OF S UCH FACTORS AS THE PRESENCE OR ABSENCE OF 
OTHER MATERIALS USED IN COMBINATION WITH THE GOODS, OR THE MANNER OF USE OR APPLICATION, 
INCLUDING WEATHER, ALL OF WHICH ARE BEYOND THE CONTROL OF MANUFACTURER OR SELLER AND 
ASSUMED BY BUYER OR USER. THIS WRITING CONTAINS ALL OF THE REPRESENTATIONS AND 
AGREEMENTS BETWEEN BUYER, MANUFACTURER AND SELLER, AND NO PERSON OR AGENT OF 
MANUFACTURER OR SELLER HAS ANY AUTHORITY TO MAKE ANY REPRESENTATION OR WARRANTY OR 
AGREEMENT RELATING IN ANY WAY TO THESE GOODS. 
 
LIMITATION OF LIABILITY 
TO THE EXTENT CONSISTENT WITH APPLICABLE LAW, IN NO EVENT SHALL MANUFACTURER OR SELLER 
BE LIABLE FOR SPECIAL, INCIDENTAL, OR CON SEQUENTIAL DAMAGES, OR FOR DAMAGES IN THEIR 
NATURE OF PENALTIES RELATING TO THE GOODS SOLD, INCLUDING USE, APPLICATION, HANDLING, AND 
DISPOSAL. MANUFACTURER OR SELLER SHALL NOT BE LIABLE TO BUYER OR USER BY WAY OF 
INDEMNIFICATION TO BUYER OR TO CUSTOMERS OF BUYER, IF ANY, OR FOR ANY DAMAGES OR SUMS OF 
MONEY, CLAIMS OR DEMANDS WHATSOEVER, RESULTING FROM OR BY REASON OF, OR RISING OUT OF 
THE MISUSE, OR FAILURE TO FOLLOW LABEL WARNINGS OR INSTRUCTIONS FOR USE, OF THE GOODS 
SOLD BY MANUFACTURER OR SELLER TO BUYER. ALL SUCH RISKS SHALL BE ASSUMED BY THE BUYER, 
USER, OR ITS CUSTOMERS. BUYER’S OR USER’S EXCLUSIVE REMEDY, AND MANUFACTURER’S OR 
SELLER’S TOTAL LIABILITY SHALL BE FOR DAMAGES NOT EXCEEDING THE COST OF THE PRODUCT. 
 
If you do not agree with or do not accept any of directions for use, the warranty disclaimers, or limitations on liability, do 
not use the product, and return it unopened to the Seller, and the purchase price will be refunded. 
 
Avenge® and Assert® are registered trademarks of BASF Corp. 
Sencor® is a registered trademark of Bayer CropScience. 
Raindrop® is a registered trademark of Delavan Corporation. 
Curtail® is a registered trademark of Dow Agrosciences LLC. 
Glean®, Finesse®, Ally®, Harmony® Extra, Express®, Lexone® are registered trademarks of E.I. DuPont DeNemours 
and Co. 
Amber® is a registered trademark of Syngenta Crop Protection, Inc. 
Roundup® is a registered trademark of Monsanto Company. 
Weedone® and Weedar® are registered trademarks of 
 NuFarm. 
Bison® and Dimetric® are registered trademarks of Winfield Solutions, LLC.