Weed Control Guide for Ohio Field Crops

Corn: Postemergence Herbicides - Systemic

Herbicide	Formulation	Product Rate Range
Beacon	75DF	3/8 - 3/4 oz

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

• Beacon (primisulfuron) is a translocated sulfonylurea herbicide that controls or suppresses annual and perennial grasses and controls annual broadleaf weeds. Beacon provides only partial control of foxtail species and may be less effective than Accent for rhizome johnsongrass and quackgrass control, but is generally more effective than Accent for broadleaf weed control.
• Mode of action: ALS inhibitor.
• Mixtures of Beacon plus Banvel, Clarity, or 2,4-D will suppress a number of perennial broadleaf weeds.
• Beacon is labeled for use on field corn, popcorn, and seed corn. Popcorn and inbred lines grown for seed may be severely injured by Beacon and should be thoroughly tested for potential sensitivity to Beacon before treating large acreage. Do not use Beacon on sweet corn.
• Apply broadcast or as a directed spray when field corn is between 4 and 20 inches tall, and as a directed spray after corn is 20 inches tall and before tassel emergence. All applications to inbred lines and popcorn should be made post-directed or semi-directed (nozzles positioned to avoid placing spray in whorl) after corn is 10 inches tall but before tassel emergence.
• Apply with nonionic surfactant (0.25% v/v) or crop oil concentrate (1 to 4 pints per acre); crop oil concentrate is generally the preferred additive. Liquid nitrogen fertilizer (2 to 4 quarts/A) or ammonium sulfate (2 to 4 lbs/A) may be added, but should not substitute for surfactant or oil concentrate. Crop oil concentrate plus nitrogen fertilizer can be use when tank-mixing with atrazine, Accent, or 2 oz/A or less of Banvel or Clarity. Most other tank-mixes should be applied with nonionic surfactant. See label for detailed information on tank-mixing.
• Apply when grasses are at the following heights: shattercane and seedling johnsongrass 4 to 12 inches; rhizome johnsongrass 8 to 16 inches; quackgrass 4 to 8 inches; fall panicum less than 2 inches. Beacon will control common and giant ragweed that are 2 to 9 inches tall. Most other broadleaf weeds should be 1 to 4 inches tall when Beacon is applied.
• Allow 4 hours between application and rainfall.
• Crop rotation restrictions: wheat - 3 months after application; soybeans, alfalfa, sweet corn, oats - 8 months; most other crops - 18 months.
• To avoid crop injury, do not apply Beacon 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 Beacon application.

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