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1 July 2007 Control of Acetolactate Synthase–Resistant Shattercane (Sorghum Bicolor) in Field Corn with Kih-485
Steven R. King, Ronald L. Ritter, Edward S. Hagood, Hiwot Menbere
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Abstract

Experiments were conducted in 2004 and 2005 in Virginia to evaluate KIH-485 for shattercane control. KIH-485 was applied to glyphosate-resistant corn at three rates (166, 209, and 250 g ai/ha) and two timings (preemergence [PRE] and postemergence [POST]) and compared to standard rates of S-metolachlor, acetochlor, and pendimethalin. PRE treatments were applied alone, while POST treatments were combined with 1,121 g ai/ha of glyphosate. A single POST application of glyphosate, a nontreated weedy control (WC), and a weed-free control (WFC) were also evaluated. In 2004, at 1 mo after planting (MAP), shattercane was controlled 73, 86, and 93% with the three PRE treatments of KIH-485 compared to only 50, 49, and 48% control with S-metolachlor, acetochlor, and pendimethalin, respectively. Similar levels of shattercane control were also observed with these treatments at 1 MAP in 2005. In both years at 4 MAP, KIH-485 combined with glyphosate applied POST controlled shattercane 96% or greater. However, when glyphosate was combined with S-metolachlor, acetochlor, or pendimethalin, shattercane control was less than 88% in either year. Corn yields with POST applications of KIH-485 plus glyphosate were equivalent to yield from the WFC and greater than yield from any PRE treatment. Early-season shattercane control was promising with KIH-485; however, season-long control only occurred when KIH-485 was applied POST in combination with glyphosate.

Nomenclature: Acetochlor, glyphosate, KIH-485, 3-[(5-difluoromethoxy-1-methyl-3-trifluoromethylpyrazol-4-yl)methylsufonyl]-4,5-dihydro-5,5-dimethylisoxazole, S-metolachlor, pendimethalin, shattercane, Sorghum bicolor (L.) Moench SORVU, corn, Zea mays L. ZEAMX

Steven R. King, Ronald L. Ritter, Edward S. Hagood, and Hiwot Menbere "Control of Acetolactate Synthase–Resistant Shattercane (Sorghum Bicolor) in Field Corn with Kih-485," Weed Technology 21(3), 578-582, (1 July 2007). https://doi.org/10.1614/WT-06-155.1
Received: 18 September 2006; Accepted: 1 December 2006; Published: 1 July 2007
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