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Glyphosate-resistant Palmer amaranth (Amaranthus palmeri) confirmed in Georgia

Published online by Cambridge University Press:  20 January 2017

A. Stanley Culpepper ,
Timothy L. Grey ,
William K. Vencill ,
Jeremy M. Kichler ,
Theodore M. Webster ,
Steve M. Brown ,
Alan C. York ,
Jerry W. Davis  and
Wayne W. Hanna
Timothy L. Grey
Affiliation:
Crop and Soil Science Department, The University of Georgia, P.O. Box 748, Tifton, GA 31794
William K. Vencill
Affiliation:
Crop and Soil Science Department, The University of Georgia, 4105 Plant Science, Athens, GA 30602
Jeremy M. Kichler
Affiliation:
Macon County Extension Service, The University of Georgia, P.O. Box 486, Oglethorpe, GA 31068
Theodore M. Webster
Affiliation:
USDA-ARS, Crop Protection and Management Research Unit, Coastal Plain Experiment Station, Tifton, GA 31794
Steve M. Brown
Affiliation:
Crop and Soil Science Department, The University of Georgia, P.O. Box 1209, Tifton, GA 31793
Alan C. York
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695
Jerry W. Davis
Affiliation:
Experimental Statistics, The University of Georgia, 1109 Experiment Street, Griffin, GA 30223
Wayne W. Hanna
Affiliation:
Crop and Soil Science Department, The University of Georgia, P.O. Box 748, Tifton, GA 31794
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Abstract

A glyphosate-resistant Palmer amaranth biotype was confirmed in central Georgia. In the field, glyphosate applied to 5- to 13-cm-tall Palmer amaranth at three times the normal use rate of 0.84 kg ae ha−1 controlled this biotype only 17%. The biotype was controlled 82% by glyphosate at 12 times the normal use rate. In the greenhouse, I 50 values (rate necessary for 50% inhibition) for visual control and shoot fresh weight, expressed as percentage of the nontreated, were 8 and 6.2 times greater, respectively, with the resistant biotype compared with a known glyphosate-susceptible biotype. Glyphosate absorption and translocation and the number of chromosomes did not differ between biotypes. Shikimate was detected in leaf tissue of the susceptible biotype treated with glyphosate but not in the resistant biotype.

Keywords

GlyphosatePalmer amaranth, Amaranthus palmeri S. WatsAMAPAAbsorptionglyphosate resistanceherbicide resistanceresistance mechanismtranslocationweed resistance
Type
Research Article
Information
Weed Science , Volume 54 , Issue 4 , August 2006 , pp. 620 - 626
Copyright
Copyright © Weed Science Society of America 

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