Weed Control Guide for Ohio Field Crops

Corn: Postemergence Herbicides - Systemic

Herbicide	Formulation	Product Rate Range
Accent SP	75DF	2/3 oz (1 packet per 4 acres)

Tank-mix with: Buctril/Moxy, Banvel, Marksman, atrazine, Buctril/atrazine, Beacon, Resource, Exceed, Clarity.

• Accent (nicosulfuron) is a translocated sulfonylurea herbicide that controls annual and perennial grasses and some annual broadleaf weeds, including foxtails, fall panicum, johnsongrass, quackgrass, shattercane, Pennsylvania smartweed, pigweed, and annual morningglory. Accent does not control crabgrass. Application of Accent with Banvel, Clarity, or Marksman will suppress or control many perennial broadleaf weeds..
• Mode of action: ALS inhibitor.
• Accent is labeled for use on field corn, popcorn, and seed corn. Growers should contact seed suppliers for recommendations and information on crop tolerance and use of soil-applied organophosphate insecticides prior to Accent use on popcorn or seed corn. Do not apply to any white popcorn inbred or hybrid unless approved by the seed supplier. Accent can be used on High Lysine, Waxy, White or other Food Grade hybrids.
• Accent can be applied broadcast or as a directed spray to field corn that is up to 20 inches tall or up to 6 collars (whichever comes first). Apply as a directed spray when corn is 20 to 36 inches tall. Do not apply to corn that is at or past the 10-collar stage or more than 36 inches tall.
• Accent can be applied broadcast to popcorn or seed corn that is less than 20 inches tall or up to 6 collars (whichever comes first). Do not apply to popcorn or seed corn that is more than 20 inches tall.
• OSU research has shown it can be difficult to achieve adequate season-long weed control with a single postemergence application of herbicides with limited residual activity (such as Accent). Applying a reduced rate of a preplant or preemergence herbicide prior to postemergence herbicide application will result in more consistent control of longer duration.
• For best results, apply Accent with crop oil concentrate (1 gallon/100 gallons spray) plus nitrogen fertilizer solution (28% - 2 to 4 quarts/A) or ammonium sulfate (2 to 4 lbs/A). Substituting a methylated seed oil (Meth Oil, Priority MSO, Sun-It II, for example) for crop oil concentrate can improve control under drought-stressed conditions. Nonionic surfactant (1 to 2 qts/100 gallons spray) can also be used instead of crop oil if required in a tank-mix with another herbicide.
• Apply in a spray volume of at least 10 gpa with a pressure of 20 to 40 psi. Increase volume to at least 15 gpa in heavy weed pressure. Avoid spraying excessive amounts of herbicide directly into the corn whorl.
• Apply when grasses are at the following heights: foxtails and fall panicum 2 to 4 inches; quackgrass 4 to 10 inches; shattercane and seedling johnsongrass 4 to 12 inches; rhizome johnsongrass 8 to 18 inches.
• Control of yellow and green foxtail may be reduced in some tank-mixes with broadleaf herbicides. Consult the label for spray additive recommendations when tank-mixing with broadleaf herbicides, and follow the most restrictive label with regard to maximum corn size at the time of application.
• Allow 4 hours between application and rainfall. Control may be reduced if applied during conditions of drought stress, abnormally hot or cold weather, when daytime temperatures do not exceed 50 degrees, or following periods of large day/night temperature fluctuations.
• Crop rotation restrictions: soybeans - 15 days after application; wheat, rye - 4 months; oats - 8 months; dry beans, peas - 10 months; alfalfa, red clover - 12 months; other crops - 10 months if soil pH is 6.5 or less and 18 months is soil pH is greater than 6.5.
• Where Accent is applied to corn previously treated with soil applications of organophosphate insecticides, temporary crop injury may occur. Do not apply Accent to corn previously treated with Counter 20CR applied in-furrow at planting or over-the-row at cultivation. Application of Accent to corn treated with Counter 20CR applied in a band at planting may cause severe crop injury on soils with 4% or less organic matter content. Do not apply Accent to popcorn or seed corn that has been treated with any formulation of Counter insecticide.
• Do not tank-mix Accent with foliar-applied organophosphate insecticides or with Basagran, Laddok, or 2,4-D. Do not apply these materials within 7 days before through 3 days after applying Accent.

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