Weed Control Guide for Ohio Field Crops

Corn: Postemergence Herbicides - Systemic

Herbicide	Formulation	Product Rate Range
Hornet	78.5WDG	2 to 5 oz

Tank-mix with: Banvel, Clarity, 2,4-D, atrazine, Buctril/Moxy, Basis Gold, Accent, Aim, Stinger.

• Hornet is a premix of flumetsulam (Python) plus clopyralid (Stinger), translocated herbicides, that controls annual broadleaf weeds and suppresses perennial broadleaf weeds. Hornet controls ragweeds, velvetleaf, cocklebur, Pennsylvania smartweed, and small marestail, but is not effective for control of lambsquarters, pigweeds, black nightshade, and annual morningglory. The higher rates can suppress or control some perennial weeds, including dandelion and Jerusalem artichoke.
• Mode of action: ALS inhibitor (flumetsulam), growth regulator (clopyralid).
• Hornet will control the above-ground growth of Canada thistle, but may be less effective than labeled rates of Stinger for long-term control of thistle. Tank-mixing Hornet with Stinger will improve long-term control.
• Apply broadcast when weeds are 2 to 8 inches tall and field corn is up to 20 inches tall or at the 6-collar stage, whichever occurs first. Hornet can be applied as a directed postemergence application using drop nozzles to corn that is 20 to 36 inches tall.
• Apply with nonionic surfactant (1 quart/100 gallons) or crop oil concentrate (1 gallon/100 gallons). Under dry conditions, the addition of nitrogen fertilizer solution (2 1/2 gallons/100 gallons) may improve control.
• Apply in a spray volume of 10 to 40 gpa with a spray pressure of 20 to 40 psi.
• To avoid severe crop injury, do not apply to corn previously treated with Counter or Thimet. Application to corn treated with other organophosphate insecticides may cause temporary crop injury. Do not tank-mix with foliar organophosphate insecticides, or apply insecticides within 10 days before or after Hornet application.
• Do not apply to corn that shows symptoms of injury from previously applied herbicides.
• Do not apply to popcorn or sweet corn. Corn inbred lines may be injured by Hornet.
• Crop rotation restrictions: wheat, rye - 4 months; alfalfa, soybeans - 10 1/2 months; potatoes, tobacco - 18 months; sugar beets and most other crops - 26 months plus field bioassay.

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