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Glufosinate Efficacy on Annual Weeds Is Influenced by Rate and Growth Stage

Published online by Cambridge University Press:  12 June 2017

Gregory J. Steckel ,
Loyd M. Wax ,
F. William Simmons  and
William H. Phillips II
Gregory J. Steckel
Affiliation:
Department of Crop Science, University of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801
Loyd M. Wax
Affiliation:
USDA-ARS, Crop Protection Research, Department of Crop Science, University of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801
F. William Simmons
Affiliation:
Department of Natural Resources and Environmental Science, University of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801
William H. Phillips II
Affiliation:
Department of Crop Science, University of Illinois, 1102 South Goodwin Avenue, Urbana, IL 61801
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Abstract

Field experiments were conducted in 1993, 1994, and 1995 to determine the effects of glufosinate rate and application timing on giant foxtail, common lambsquarters, common cocklebur, and Pennsylvania smartweed control in absence of a crop. Glufosinate at 140 g ai/ha controlled less than 80% of the weed species evaluated. When glufosinate rate was increased to 420 g/ha and applied to 10-cm giant foxtail, control was greater than 80% all 3 yr of the study. Applications made to 10-cm plants resulted in 80% or greater control for common cocklebur all 3 yr and Pennsylvania smartweed 2 of the 3 yr with 420 and 560 g/ha, respectively. Common lambsquarters was the most tolerant species evaluated and was not consistently controlled acceptably (> 80%), even with glufosinate at rates of 560 g/ha. Control with glufosinate at 420 or 560 g/ha was most effective when applied at the 10-cm weed height compared either to the 5- or 15-cm weed height.

Keywords

Glufosinate, 2-amino-4-(hydroxymethylphosphinyl)butanoic acidgiant foxtail, Setaria faberi Herrm. # SETFAcommon lambsquarters, Chenopodium album L. # CHEALcommon cocklebur, Xanthium strumarium L. # XANSTPennsylvania smartweed, Polygonum pensylvanicum L. # POLPYSetaria faberiChenopodium albumXanthium strumariumPolygonum pensylvanicumSETFACHEALXANSTPOLPYDAT, days after treatmentGS, glutamine synthetase
Type
Research
Information
Weed Technology , Volume 11 , Issue 3 , September 1997 , pp. 484 - 488
Copyright
Copyright © 1997 by the Weed Science Society of America 

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