Weed Control Guide for Ohio Field Crops

Corn: Soil-Applied Herbicides Preplant or Preemergence

Herbicide	Formulation	Product Rate Range
Hornet	78.5WDG	4 - 6 oz

Tank-mix with: MicroTech, Partner, Dual Magnum, Outlook, Surpass, Harness, FulTime, others.

• Hornet is a premix of flumetsulam (Python) plus clopyralid (Stinger). In addition to the broadleaf weeds controlled by Python, Hornet controls cocklebur and common ragweed. Expect partial control of giant ragweed.
• Mode of action: ALS inhibitor (flumetsulam), growth regulator (clopyralid).
• Tank-mix with a grass herbicide to control giant foxtail and other grass weeds. Hornet can be tank-mixed at a rate of 3 to 4 oz/A with atrazine premix products (Bicep, Harness Xtra, etc) to improve control of triazine-resistant lambsquarters and other broadleaf weeds.
• Apply preplant (up to 30 days before planting), preemergence, or at the spike stage. When using the rates shown here, apply before the corn is 2 inches tall. Preplant application with crop oil concentrate can control emerged Canada thistle and small annual broadleaf weeds, including mustards, shepherdspurse, ragweeds, and Pennsyvania smartweed.
• Do not apply to sweet corn or popcorn. Inbred lines should be tested for crop tolerance before treating large acreages.
• Hornet may injure corn, especially when growing conditions are unfavorable soon after application. This injury may appear as stunting, temporary yellowing, and reduction in root growth. To avoid injury, plant at least 1 1/2 inches deep and do not use Hornet in soils with an average of less than 1 1/2 percent organic matter.
• Soil-applied organophosphate insecticides may increase the risk of crop injury, especially when applied in-furrow. To avoid injury, apply insecticides in a band or T-band. Do not use Hornet if Counter or Thimet has been or will be applied to the corn.
• Corn treated with Hornet that is stressed or damaged by herbicide or other factors should not be treated with Accent, Permit, Exceed, Basis, Beacon, or other ALS-inhibiting herbicides.
• Do not apply where soil pH is greater than 7.8. Do not apply to soils with a combination of pH less than 5.9 and organic matter content greater than 5%.
• Crop rotation restrictions: Wheat, rye - 4 months after application; soybeans, alfalfa, popcorn - 10 1/2 months; most other crops 18 to 26 months plus successful field bioassay.

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