University of Illinois

No. 3/April 11, 1997

Wild Garlic Control in Winter Wheat

Harmony Extra is used at 0.5 to 0.6 ounce per acre when wild garlic is less than 12 inches tall, with 2 to 4 inches of new growth. Make applications before the flag leaf is visible. Thorough spray coverage of all wild garlic plants is essential. Add nonionic surfactant (NIS) at 1 quart per 100 gallons of spray (0.25% v/v). Temporary stunting and yellowing may occur when Harmony Extra is applied using liquid fertilizer as the carrier, so reduce the NIS to 1/8 to 1/16% v/v to minimize crop burn. Wild garlic control will probably be erratic if no NIS is used.

Peak can be applied for wild garlic control at 0.25 to 0.5 ounce per acre, from the 3-leaf stage of wheat until before the second node is detectable in stem elongation. Always include COC at 1 to 4 pints per acre or NIS at 1 to 2 quarts per 100 gallons of spray. If Peak is applied in the springtime, sorghum can be doublecropped--but not soybeans, due to the 10-month recropping restriction to soybeans.

Marshal McGlamery and Aaron Hager, Department of Crop Sciences, (217)333-4424