Weed Control Guide for Ohio Field Crops

Corn: Postemergence Herbicides - Systemic

Herbicide	Formulation	Product Rate Range
Exceed	57DF	1 oz (1 packet per 4 acres)

Tank-mix with: Banvel, Clarity, 2,4-D, atrazine, Buctril/Moxy, Buctril+atrazine, Marksman, Beacon, Accent.

• Exceed is a premix of prosulfuron (Peak) plus primisulfuron (Beacon), translocated sulfonylurea herbicides. Exceed controls annual broadleaf weeds, including velvetleaf, ragweeds, cocklebur, Pennsylvania smartweed, burcucumber, and redroot pigweed. Exceed can suppress or control small (<2 inch) annual grasses in corn, and can control or suppress perennial broadleaf weeds. Most effective control/suppression of perennials will occur when tank-mixed with 2,4-D, Banvel, or Clarity. Exceed is weak on black nightshade, annual morningglories, and yellow nutsedge.
• Mode of action: ALS inhibitor.
• Exceed can occasionally carryover and injure soybeans grown the following year. Conditions increasing the risk of carryover include high soil pH, low rainfall and soil moisture for several months following application, and late-season application. Follow these guidelines to avoid carryover: 1) avoid use where soil pH is greater than 7.8. If used where soil pH is greater than 7.8, less than one inch of rain occurs within one month of application, or less than 12 inches of rain occurs within 5 months after application, plant only corn or small grains the following year; 2) north of Interstate 70, do not plant soybeans within 18 months of application (STS soybeans can be planted 10 months after application); 3) south of I-70, soybeans can be planted 10 months after application where soil pH is less than 7.8; and 4) do not apply after June 30. See label for guidelines on rotation to other crops.
• Control of lambsquarters can be variable, especially when tall or drought-stressed. Tank-mix with 2 to 4 ounces per acre of Banvel or Clarity for more consistent control of lambsquarters. Crop oil concentrate can be used when the Banvel/Clarity rate is 2 oz/A or less; use nonionic surfactant with higher rates.
• Apply when annual broadleaf weeds are 1 to 5 inches tall for best results. Exceed will control seedling johnsongrass and shattercane that are 4 to 12 inches tall.
• Apply broadcast or directed when field corn is 4 to 30 inches tall. To avoid injury and improve spray coverage on weeds, apply as a directed spray using drop nozzles when corn is more than 20 inches tall.
• For popcorn, apply as a directed spray using drop nozzles when corn plants are 10 to 30 inches tall, and before tassel emergence. For seed corn inbreds, Exceed can be applied broadcast when corn is between 4 and 20 inches tall, or until the 6-collar stage, whicever occur first. Use drop nozzles when seed corn inbreds are 20 to 30 inches tall and before tassel emergence. Inbred lines and popcorn hybrids should be thoroughly tested for sensitivity to Exceed before treating large acreages. Do not apply to sweet corn.
• Apply in a minimum spray volume of 10 gpa. Increasing the volume to at least 20 gpa can improve control in dense weed infestations.
• Apply with crop oil concentrate (1 to 4 pints/A) or nonionic surfactant (1 to 2 quarts/100 gallons). Nitrogen fertilizer solution (2 to 4 quarts/A) or AMS (2 lbs/A) may be added to improve control of velvetleaf and other weeds. Crop oil concentrate is generally more effective than nonionic surfactant. Use of a methylated seed oil (Meth Oil, Priority MSO, Sun-It II, for example) may improve control when weeds are large or drought-stressed.
• To avoid crop injury, do not apply Exceed to corn that has been previously treated with Counter 20CR applied in-furrow or over the row at cultivation. Do not make a foliar postemergence or a soil application of any organophosphate insecticide within 10 days before or 7 days after Exceed application.
• Allow 4 hours between application and rainfall.

Back | Forward | Table of Contents