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Field Presence of Glyphosate-Resistant Horseweed (Conyza Canadensis), Common Lambsquarters (Chenopodium Album), and Giant Ragweed (Ambrosia Trifida) Biotypes with Elevated Tolerance to Glyphosate

Published online by Cambridge University Press:  20 January 2017

Andrew M. Westhoven ,
Vince M. Davis ,
Kevin D. Gibson ,
Stephen C. Weller  and
William G. Johnson
Andrew M. Westhoven
Affiliation:
Purdue University, Department of Botany and Plant Pathology, 915 West State Street, West Lafayette, IN 47907
Vince M. Davis
Affiliation:
Purdue University, Department of Botany and Plant Pathology, 915 West State Street, West Lafayette, IN 47907
Kevin D. Gibson
Affiliation:
Purdue University, Department of Botany and Plant Pathology, 915 West State Street, West Lafayette, IN 47907
Stephen C. Weller
Affiliation:
Department of Horticulture and Landscape Architecture, Purdue University, 625 Agriculture Mall Drive, West Lafayette, IN 47907
William G. Johnson*
Affiliation:
Purdue University, Department of Botany and Plant Pathology, 915 West State Street, West Lafayette, IN 47907
*
Corresponding author's E-mail: wgj@purdue.edu
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Abstract

Late-season field surveys conducted in Indiana from 2003 to 2005 showed that common lambsquarters and giant ragweed plants were present in 11 and 22%, respectively, of randomly sampled soybean fields that also contained glyphosate-resistant horseweed. In the fall of 2005 and 2006, seed from 13 common lambsquarters and 22 giant ragweed populations were collected from previously surveyed fields that had confirmed glyphosate-sensitive or -resistant horseweed. The objective of this study was to determine whether the presence of glyphosate-resistant horseweed was correlated with the presence of common lambsquarters and giant ragweed biotypes with elevated tolerance to glyphosate. Through a series of greenhouse screens, 57% of common lambsquarters and 31% of giant ragweed populations collected from fields that had glyphosate-resistant horseweed expressed elevated levels of glyphosate tolerance. However, elevated tolerance to glyphosate was expressed by 33% of giant ragweed and 100% of common lambsquarters populations collected in fields that had glyphosate-sensitive horseweed. Therefore, under the parameters of this experiment and through different types of analyses, we concluded there was not a strong correlation between the late-season presence of glyphosate-resistant horseweed and common lambsquarters and giant ragweed populations with elevated glyphosate tolerance in the same field. A number of the weed populations expressed significant stunting from exposure to glyphosate, but were able to resume growth. Thus, researchers should evaluate plant regrowth in addition to biomass suppression when making assessments of glyphosate resistance in weed populations through greenhouse and field screening.

Keywords

Glyphosatecommon lambsquarters, Chenopodium album L. CHEALgiant ragweed, Ambrosia trifida L. AMBTRhorseweed, Conyza canadensis (L.) Cronq. ERICAsoybean, Glycine max (L.) MerrCorrelationdiscriminating dosefield historyindicator speciessurvey
Type
Education/Extension
Information
Weed Technology , Volume 22 , Issue 3 , September 2008 , pp. 544 - 548
Copyright
Copyright © Weed Science Society of America 

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