Weed Control Guide for Ohio Field Crops

Corn: Postemergence Herbicides - Contact

Herbicide	Formulation	Product Rate Range
AAtrex/atrazine	4L	1 1/2 - 2 qt
	90DF	1.67 - 2.22 lb

Tank-mix with: Banvel, Buctril/Moxy, 2,4-D, Basagran, Accent, Beacon, Sencor.

• Mode of action: photosynthesis inhibitor.
• Maximum rate for postemergence application to fields with no soil-applied atrazine in the same year is 2 pounds active ingredient/A. When applied postemergence to fields with soil-applied atrazine the same year, total amount of atrazine applied may not exceed 2.5 pounds active ingredient. See preplant/preemergence section for additional restrictions on atrazine application.
• Annual broadleaf weeds are more susceptible than annual grasses.
• For grass control, apply when grasses are no more than 1 1/2 inches tall. Rates of 2 pound active ingredient/A are generally required for grass control. Atrazine will not control fall panicum.
• For control of broadleaf weeds, rates of 1.2 pounds active ingredient may be sufficient. Apply until broadleaf weeds are 4 inches tall.
• Apply atrazine with 1 quart per acre crop oil concentrate for best results. Mix atrazine with water first, and add oil last.
• Postemergence applications must be made before the crop reaches 12 inches in height. If applied after June 10, plant only corn or sorghum the next year.

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