Weed Control Guide for Ohio Field Crops

Corn: Soil-Applied Herbicides Preplant or Preemergence

Herbicide	Formulation	Product Rate Range
Guardsman Max	5L	2.4 - 4.6 pints
Leadoff	5L	1.5 - 5 pints

Tank-mix with: Banvel, Clarity, Marksman, Outlook, Atrazine, Prowl, Princep, Accent, Sencor.

• Guardsman Max and Leadoff are premixes of dimethenamid (Frontier or Outlook) plus atrazine for control of annual grass and broadleaf weeds in corn.
• Mode of action: phososynthesis inhibitor (atrazine), shoot mereistem inhibitor (dimethenamid).
• Can be applied up to 30 days before planting as a single application, and up to 45 days before planting as a split application (2/3 full rate early followed by 1/3 full rate after planting). Early preplant applications are not recommended for use on coarse-textured soils or in areas where average annual rainfall exceeds 40 inches. Use the highest rate recommended for the soil type when applying early preplant.
• May be applied early postemergence to corn that is up to 12 inches tall. Weeds should be less than 1 1/2 inches tall, unless other products are tank-mixed with Guardsman Max/Leadoff to control larger emerged weeds.
• May be applied to emerged corn with surfactant or low rates of liquid nitrogen fertilizer. Do not use liquid fertilizer as the spray carrier after the crop has emerged. Crop oil concentrate may be included in postemergence applications only when Guardsman is applied alone or in combination with atrazine.
• Corn or soybeans can be planted the year following application. Regarding rotation to other crops, follow the general guidelines for atrazine.

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