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Using Soil-Applied Herbicides in Glyphosate-Resistant Soybeans along the Texas Gulf Coast

Published online by Cambridge University Press:  20 January 2017

W. James Grichar
W. James Grichar*
Affiliation:
Texas Agricultural Experiment Station, Beeville, TX 78102
*
Author's E-mail: w-grichar@tamu.edu
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Abstract

Field studies were conducted at four locations over a 2-year period to evaluate the utility of soil-applied herbicides and glyphosate timing for weed control and soybean yield. Pendimethalin, S-metolachlor plus metribuzin, and flufenacet plus metribuzin were applied pre-emergence (PRE) alone or followed by glyphosate applied early postemergence (EPOST), late postemergence (LPOST), or EPOST plus LPOST. Soil-applied herbicides or glyphosate alone failed to control (<45%) broadleaf signalgrass in 2003 due to late-season rainfall, which accounted for a late flush of growth. In 2004, soil-applied herbicides alone controlled 79–100% broadleaf signalgrass, whereas glyphosate alone or in combination with soil-applied herbicides controlled at least 99%. Barnyardgrass and tall waterhemp were controlled at least 87% with soil-applied herbicides alone and at least 95% when glyphosate was used alone or in combination with a soil-applied herbicide. Soybean yield varied, but at only one location did herbicide treatments produce higher yields than the untreated check. Under low to moderate weed pressure, the use of a soil-applied herbicide followed by glyphosate failed to increase net returns over soil-applied herbicides alone.

Keywords

Flufenacet + metribuzinglyphosateS-metolachlor + metribuzinpendimethalinbroadleaf signalgrassBrachiaria platyphylla (Griseb.) Nash #3 BRAPPbarnyardgrassEchinochloa crus-galli (L.) Beauv. # ECHCGtall waterhemp, Amaranthus tuberculatus (Moq.) J. D. Sauer # AMATUsoybean, Glycine max (L.) Merr. ‘HBK 5123RR, DP 5110RR’Application windowsequentialEPOST, early postemergencefb, followed byLPOST, late postemergencePOST, postemergencePRE, preemergence
Type
Research Article
Information
Weed Technology , Volume 20 , Issue 3 , September 2006 , pp. 633 - 639
Copyright
Copyright © Weed Science Society of America 

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