Weed Control Guide for Ohio Field Crops

Corn: Postemergence Herbicides - Systemic

Herbicide	Formulation	Product Rate Range
Basis	75DF	1/3 oz (1 packet per 4 acres)

Tank-mix with: Atrazine, Banvel, Clarity, Marksman, Prowl.

• Basis is a premix of rimsulfuron plus thifensulfuron (Pinnacle), translocated sulfonylurea herbicides. Basis controls small annual grasses and a few broadleaf weeds, and provides a few weeks of residual control of foxtails, lambsquarters, and pigweeds.
• Mode of action: ALS inhibitor.
• Apply when field corn is in the spike to 2-collar (approx. 6 inches) stage and before grass weed height exceeds 2 inches. Grasses controlled include foxtails, barnyardgrass, and fall panicum. A cultivation is generally required following Basis application for effective grass control. In OSU research, Basis has provided only fair control of grasses without cultivation.
• Controls smartweeds, lambsquarters, pigweed, and velvetleaf that are 1 to 3 inches tall. Basis should be tank mixed with another postemergence herbicide if other broadleaf weeds are present.
• Can be applied in the fall (0.33 to 0.5 oz/A) for control of winter annual weeds up to 3 inches tall, including chickweed, deadnettle, henbit, and mustards. Spring applications (0.3 to 1 oz/A) can provide burndown of small annual grass (up to 2 inch) and broadleaf (up to 3 inch) weeds, and several weeks of residual control of foxtails, lambsquarters, and pigweeds. Apply with crop oil concentrate (1%, v/v) and ammonium nitrogen fertilizer. Can be tank-mixed with other herbicides approved for these uses.
• Apply in a minimum spray volume of 15 gpa with a pressure of 20 to 40 psi. Include nonionic surfactant (1 to 2 quarts/100 gallons) plus nitrogen fertilizer solution (28% - 2 to 4 quarts/100 gallons) or ammonium sulfate (2 to 4 lb/100 gallons). Crop oil concentrate (1 to 2 gallons/100 gallons) can be substituted for surfactant under drought conditions.
• Basis may cause temporary crop injury, including stunting and bleaching of new growth. Risk of injury increases if corn is treated after the 2-collar stage.
• Where Counter 20CR or Thimet have been used, application of Basis may cause unacceptable crop injury. Injury may occur where other organophosphate insecticides are used.
• Do not apply to seed corn, popcorn, or sweet corn.
• Allow 4 hours between application and rainfall.
• Crop rotation restrictions: wheat, potatoes - 4 months; peas dry beans, snap beans - 8 months; popcorn, soybeans, sweet corn, alfalfa, sugar beets - 10 months; other crops - 18 months.

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