General Information


APPLICATION BY CHEMIGATION must be done by fixed pipe, overhead sprinkler systems or hand moved pipe. 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.

DURING AERIAL APPLICATION, human flaggers are prohibited unless in enclosed vehicles. Aerial application is prohibited within 300 feet of residential areas (e.g., homes, schools, playgrounds, hospitals, shopping areas, etc.) Pilots must use an enclosed cockpit that meets the requirements listed in the WPS for agricultural pesticides [40 CFR 170.240(d)(6)].

Apply to non-residential turf only. Do not apply to residential, playground, or schoolyard turf.

Do not apply with backpack or hand-held application equipment.


BROMAC is formulated as an emulsifiable concentrate containing the equivalent of 2 lbs. per gallon of octanoic acid ester of bromoxynil and 2 pounds per gallon of isooctyl (2-ethylhexyl ester) ester of MCPA. BROMAC is a selective postemergence herbicide for control of important broadleaf weeds infesting small grains (wheat, barley, oats, rye), and conservation reserve program areas, and grass grown for seed and flax. Optimum weed control is obtained when BROMAC is applied to actively growing weed seedlings. BROMAC is primarily a contact herbicide, therefore thorough coverage of the weed seedlings is essential for optimum control.

BROMAC 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 BROMAC 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.


BROMAC can be applied to registered use areas by ground, aerial and sprinkler irrigation equipment.


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. For optimum spray distribution and thorough coverage use of flat fan nozzles (maximum tip size 8008) with a spray pressure of 40-60 psi are recommended.

Other nozzle types and lower spray pressures that produce coarse spray droplets may not provide adequate coverage of the weeds to ensure optimum control. Raindrop nozzles and flood nozzles are not recommended as weed control with BROMAC 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 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.


Use orifice discs, cores and nozzle types and arrangements that will provide for optimum spray distribution and maximum coverage. In general a minimum spray volume of 5 GPA and a maximum pressure of 40 psi are recommended. A minimum spray volume of 3 GPA may be used if crop canopy and weed density allow adequate spray coverage at that gallonage.

Do not apply during inversion conditions, when winds are gusty or when other conditions favor poor spray coverage and/or off target spray movement. Off target spray movement can be minimized by increasing the spray volume per acre and not applying when winds exceed 10 mph.


BROMAC Herbicide can be applied through sprinkler irrigation systems to wheat, barley, oats, rye, triticale and grasses grown for seed.

Apply BROMAC Herbicide through sprinkler systems including center pivot, lateral move, side (wheel) roll, solid set or hand move 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 the 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, quickclosing 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 BROMAC Herbicide.

9. BROMAC Herbicide should be applied continuously for the duration of the water application with center pivot and continuous lateral move systems. Application of BROMAC 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 BROMAC Herbicide is diluted in the supply tank, fill the tank with half of the water amount desired, add the BROMAC and then add remaining water amount with agitation. Always dilute with at least 4 parts water to 1 part BROMAC.

13. Start the sprinklers and then inject BROMAC Herbicide into the irrigation line. BROMAC 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 recommendations for specific crops for detailed information on application rates and timings.

Refer in the label for the tank mix information.

Limitations, Restrictions, and Exceptions


CROP: Do not apply BROMAC to flax during or after the bud stage.

Use Rate Restrictions:

Do not apply more than 1 pint of BROMAC (0.25 lb bromoxynil, 0.25 lb MCPA Acid) per acre in a single growing season.


- For control of sunflower, delay application until first sunflower seedlings emerging are 4 inches in height.


- Do not apply if temperatures are expected to exceed 85°F at or 3 days following application or crop injury may occur.

- Unacceptable crop injury may occur following BROMAC application to flax grown on high organic, peat type soils.

- Application under high humidity conditions can injure flax.

- Unless otherwise instructed, do not apply BROMAC with crop oil concentrate, surfactants or nitrogen solutions.

- Do not use on ornamental flax.

- Do not plant rotational crops within 30 days following bromoxynil herbicide application.

Restricted Entry Interval

48 hours