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1 July 2007 Texasweed (Caperonia Palustris) Control in Soybean with Postemergence Herbicides
Daniel H. Poston, Vijay K. Nandula, R. Matt Griffin, Clifford H. Koger
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Field and greenhouse studies were conducted in 2000 and 2001 in Mississippi to determine the most effective POST herbicide programs for control of Texasweed in glyphosate-resistant soybean. In the field, Texasweed plants recovered from most POST herbicide treatments, and plant death rarely occurred. A sequential application of 1,100 g ae/ha glyphosate followed by 840 g/ha glyphosate was the only treatment that controlled at least 90% of Texasweed 4 wk after treatment. Texasweed control ranged from 80 to 87% for lower rates of glyphosate applied once or twice and 390 g ai/ha fomesafen. The addition of fomesafen or other herbicides to glyphosate did not improve control compared with glyphosate alone. In the greenhouse, glyphosate at 560 g/ha controlled 93 and 90% of one- and two-leaf plants, respectively, but at least 1,400 g/ha was required to obtain 90% control of four-leaf plants. Fomesafen at 260 g/ha controlled 93 to 99% of one- to four-leaf Texasweed plants in the greenhouse.

Nomenclature: Fomesafen, glyphosate, Texasweed, Caperonia palustris (L.) St. Hil, soybean, Glycine max (L.) Merr

Daniel H. Poston, Vijay K. Nandula, R. Matt Griffin, and Clifford H. Koger "Texasweed (Caperonia Palustris) Control in Soybean with Postemergence Herbicides," Weed Technology 21(3), 670-673, (1 July 2007).
Received: 17 May 2006; Accepted: 1 January 2007; Published: 1 July 2007

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