Corn weed guide update for 2010

Editor’s note: This article is from the archives of the MSU Crop Advisory Team Alerts. Check the label of any pesticide referenced to ensure your use is included.

Products added for 2010

Five new herbicides were added to the corn section of the Weed Control Guide in 2010. They are Accent Q (p. 29), Capreno (p. 32), Integrity (p. 40), Sharpen (p. 22), Steadfast Q (p. 30).

Accent Q (nicosulfuron + safener) is a new formulation of Accent with an added safener for enhanced crop safety. Accent Q can be applied from emergence to V5 or 20-inch corn at a rate of 0.9 oz/A. The addition of crop oil concentrate is recommended. Accent Q has the same spectrum of weed control as Accent, with excellent control of grasses and pigweed.

Capreno (tembotrione + thiencarbazone-methyl + safener) is a new premix for postemergence applications from emergence to V4 at a recommended rate of 3 oz/A. The addition of COC is preferred with AMS at 8.5 lb/100 gal. Capreno is a premix of Laudis and an ALS grass herbicide which provides excellent control of a wide range of broadleaf and grass weed species. Atrazine at 0.5 lb/A plus COC can be added to expand the residual broadleaf weed control spectrum. The presence of thiencarbazone-methyl increases the chance for organophosphate insecticide interactions and extends the rotation period for several crops including alfalfa, dry beans, potatoes, and sugarbeets.

Integrity (saflufenacil + dimethenamid) is a new premix for preemergence applications in corn at a recommended rate of 13 oz/A on most soils in Michigan. Integrity provides excellent residual control of grass and broadleaf weed species including common lambsquarters, pigweed, and most grass species.

Sharpen (saflufenacil) is a new burndown and preemergence herbicide for use in corn. The burndown rate is 1 oz/A and provides excellent control of horseweed (marestail) and good control of several common winter annuals in Michigan. Preemergence applications will typically be made at 2.5 oz/A in Michigan to control a broad range of broadleaf weed species. In general, Sharpen will not be applied alone as a preemergence application, but rather in a premix with Outlook available as Integrity.

Steadfast Q (nicosulfuron + rimsulfuron + safener) is a new formulation of Steadfast with an added safener for enhanced crop safety. Steadfast Q can be applied from emergence to V6 or 20-inch corn at a rate of 1.5 oz/A. The addition of crop oil concentrate and AMS is recommended. Steadfast Q has the same spectrum of weed control as Steadfast, with excellent control of grasses and pigweed.

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