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Texasweed (Caperonia palustris) Control in Soybean with Postemergence Herbicides

Published online by Cambridge University Press:  20 January 2017

Daniel H. Poston ,
Vijay K. Nandula ,
R. Matt Griffin  and
Clifford H. Koger
Daniel H. Poston
Affiliation:
Delta Research and Extension Center, Mississippi State University, 82 Stoneville Road, P.O. Box 197, Stoneville, MS 38776
Vijay K. Nandula*
Affiliation:
Delta Research and Extension Center, Mississippi State University, 82 Stoneville Road, P.O. Box 197, Stoneville, MS 38776
R. Matt Griffin
Affiliation:
Delta Research and Extension Center, Mississippi State University, 82 Stoneville Road, P.O. Box 197, Stoneville, MS 38776
Clifford H. Koger
Affiliation:
U.S. Department of Agriculture–Agricultural Research Service Crop Production and Genetics Research Unit, 141 Experiment Station Road, Stoneville, MS 38776
*
Corresponding author's E-mail: [email protected]
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Abstract

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.

Keywords

FomesafenglyphosateTexasweedCaperonia palustris (L.) St. Hilsoybean, Glycine max (L.) MerrWeed control
Type
Research
Information
Weed Technology , Volume 21 , Issue 3 , September 2007 , pp. 670 - 673
Copyright
Copyright © Weed Science Society of America 

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References

Literature Cited

Koger, C. H., Reddy, K. N., and Poston, D. H. 2004. Factors affecting seed germination, seedling emergence, and survival of Texasweed (Caperonia palustris). Weed Sci. 18:1058–1065.Google Scholar
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