Weed Control Guide for Ohio Field Crops

Corn: Postemergence Herbicides - Systemic

Herbicide	Formulation	Product Rate Range
Permit	75DF	2/3 to 1 1/3 oz

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

• Permit (halosulfuron) is a translocated sulfonylurea herbicide that controls yellow nutsedge and annual broadleaf weeds, including velvetleaf, ragweeds, cocklebur, and redroot pigweed. Permit is weak on lambsquarters and annual morningglories. Combinations of Permit plus Banvel, Clarity, or 2,4-D will improve control of these weeds and control or suppress perennial broadleaf weeds.
• Mode of action: ALS inhibitor.
• Apply when field corn is in the spike through layby stage and most annual weeds are 1 to 6 inches tall for best results. When corn is more than 24 inches tall, tank-mixes of Permit with other postemergence corn herbicide should be applied with drop nozzles to ensure weed coverage and avoid spraying directly into the whorl. Follow the most restrictive label with regard to maximum corn size when tankmixing.
• Permit can be applied broadcast (2/3 oz/A) to sweet corn and popcorn in the spike through layby stage. Two applications are allowed per year, but the second should be applied with crop nozzles. Sweet corn and popcorn hybrids should be thoroughly tested for sensitivity to Permit before treating large acreages. Do not apply to the sweet corn variety 'Jubilee'. Do not apply when corn is under stress from environmental conditions.
• For control of yellow nutsedge, apply 1 to 1 1/3 ounces/A when nutsedge is 4 to 12 inches tall. Dense populations of nutsedge may require a second application.
• Apply in a minimum spray volume of 10 gpa with nonionic surfactant (1 to 2 quarts/100 gallons) or crop oil concentrate (1 gallon/100 gallons). Include nitrogen fertilizer solution (2 to 4 quarts/A) or AMS (2 to 4 lbs/A) when velvetleaf or redroot pigweed is present.
• Allow 4 hours between application and rainfall.
• Do not apply to popcorn or sweet corn.
• Tank mixtures may cause temporary crop injury, especially when the tank-mix partner is Accent or Beacon. Do not apply in a tank-mix if the crop is under stress due to drought, water saturated soils, low fertility, hail, frost, insects, or when the maximum daytime temperature is above 92 degrees.
• Crop rotation restrictions: fall-seeded small grains - 2 months after application; soybeans, peas, dry beans, potatoes, and forage legumes - 9 months; tomatoes - 8 months; sugar beets - 24 months; most other crops - 9 to 18 months.

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