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Weed Control and Snap Bean (Phaseolus vulgaris) Response to Reduced Rates of Fomesafen

Published online by Cambridge University Press:  20 January 2017

William A. Bailey
Affiliation:
Eastern Shore Research and Extension Center, Virginia Polytechnic Institute and State University, Painter, VA 23420
Henry P. Wilson*
Affiliation:
Eastern Shore Research and Extension Center, Virginia Polytechnic Institute and State University, Painter, VA 23420
Thomas E. Hines
Affiliation:
Eastern Shore Research and Extension Center, Virginia Polytechnic Institute and State University, Painter, VA 23420
*
Corresponding author's E-mail: hwilson@vt.edu

Abstract

Field experiments were conducted in 1996, 1999, and 2000 to evaluate weed control and snap bean response to postemergence applications of fomesafen at registered and reduced rates. S-Metolachlor was applied preemergence to all plots to suppress annual grasses. Snap bean injury generally increased as fomesafen rate increased, but at rates up to 0.28 kg ai/ha, injury by fomesafen was similar to or less than that from bentazon. Fomesafen at rates as low as 0.07 kg/ha provided near-complete control of common ragweed, and rates of 0.14 kg/ha or more of fomesafen controlled ivyleaf and pitted morningglories and 5-cm or smaller common lambsquarters as effectively as did bentazon. Control of all weed species from fomesafen alone at 0.21 kg/ha did not improve with the addition of bentazon at 0.28 kg/ha. Although snap bean injury from fomesafen was as high as 43% 1 wk after treatment, snap bean yield and net returns were similar to those from S-metolachlor alone. In a rate and application timing study, fomesafen at 0.14 kg/ha applied to three-trifoliolate snap bean was the least injurious to the crop, whereas applications at 0.28 kg/ha to one- or two-trifoliolate snap bean provided the best weed control.

Type
Research
Copyright
Copyright © Weed Science Society of America 

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