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Rush Skeletonweed (Chondrilla juncea) Control in Pacific Northwest Winter Wheat

Published online by Cambridge University Press:  10 May 2018

John F. Spring ,
Mark E. Thorne ,
Ian C. Burke  and
Drew J. Lyon
John F. Spring*
Affiliation:
Area Extension Agent, Colorado State University Extension, Julesburg, CO, USA
Mark E. Thorne
Affiliation:
Research Associate, Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
Ian C. Burke
Affiliation:
Associate Professor, Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
Drew J. Lyon
Affiliation:
Professor, Department of Crop and Soil Sciences, Washington State University, Pullman, WA, USA
*
Author for correspondence: John F. Spring, Area Extension Agent, Colorado State University Extension, Julesburg, CO, 80737. (E-mail: john.spring@colostate.edu)
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Abstract

Rush skeletonweed is emerging as a regionally important weed of winter wheat production in eastern Washington. Field studies were conducted during the 2016 and 2017 crop years to evaluate several auxin herbicides applied at two seasonal timings (fall or spring) for control of rush skeletonweed in winter wheat. Clopyralid (210 g ae ha-1) provided>90% visual control of rush skeletonweed in both years of the study and aminopyralid (10 g ae ha-1) provided>80% visual control. Aminocyclopyrachlor, dicamba, and 2,4-D provided<55% control of rush skeletonweed. Season of application did not meaningfully affect efficacy of any herbicide tested. Wheat yields were reduced by 39 to 69% compared to the non-treated check when aminocyclopyrachlor was applied in the spring. Clopyralid is an effective option for control of rush skeletonweed in Pacific Northwest winter wheat.

Keywords

Michael Walsh, University of SydneyAminocyclopyrachloraminopyralidclopyraliddicamba2,4-Drush skeletonweed, Chondrilla juncea L.wheat, Triticum aestivum L.Perennial weed controlweed biotype
Type
Weed Management-Major Crops
Information
Weed Technology , Volume 32 , Issue 4 , August 2018 , pp. 360 - 363
Copyright
© Weed Science Society of America, 2018 

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