Weed Control Guide for Ohio Field Crops

Roundup Ready Corn - Postemergence Herbicides

Herbicide	Formulation	Product Rate Range
Roundup Ultra Max	3.75S	Up to 2.4 qts (ground application)
		Up to 26 oz (aerial application)
Touchdown	3S	Up to 3 qts (ground application)
		Up to 1 qt (aerial application)
Glyphomax, Glyphomax Plus	3S	Up to 3 qts (ground application)
		Up to 1 qt (aerial application)

• The glyphosate products listed above can be applied as a preharvest treatment to control perennial and annual weeds in corn. Other glyphosate products may be labeled for this use also. Consult labels for specific recommendations on use rate, adjuvant use, and rainfast intervals.
• Dessication of weeds from glyphosate application is less rapid than that from Gramoxone. Preharvest applications of glyphosate may provide a good opportunity to control perennial weeds because growth of perennials is undisturbed compared to postharvest applications.
• Mode of action: EPSP synthase inhibitor.
• Apply when grain moisture is 35 percent or less. Corn should be physiologically mature (black layer formed) with maximum kernel fill complete. Apply at least 7 days before harvest.
• Depending upon the glyphosate product, the label prohibits or recommends avoiding preharvest application to corn grown for seed, due to the potential for a reduction in germination or vigor.

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