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ACCase-Inhibitor Herbicide Resistance in Downy Brome (Bromus tectorum) in Oregon

Published online by Cambridge University Press:  20 January 2017

Daniel A. Ball ,
Sandra M. Frost  and
Larry H. Bennett
Daniel A. Ball*
Affiliation:
Oregon State University, Columbia Basin Research Center, P.O. Box 370, Pendleton, OR 97801
Sandra M. Frost
Affiliation:
Oregon State University, Columbia Basin Research Center, P.O. Box 370, Pendleton, OR 97801
Larry H. Bennett
Affiliation:
Oregon State University, Columbia Basin Research Center, P.O. Box 370, Pendleton, OR 97801
*
Corresponding author's E-mail: [email protected]
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Abstract

In spring 2005, a downy brome population with possible resistance to fluazifop-P, an acetyl-CoA carboxylase (ACCase) inhibitor (group 1) herbicide was found in a commercial creeping red fescue seed production field, near La Grande, OR, where fluazifop-P had been used to control downy brome repeatedly over 7 yr. Greenhouse experiments were conducted to confirm resistance to a number of group 1 herbicides. The suspected resistant downy brome accession was tested for resistance to fluazifop-P and tested for cross-resistance to other aryloxyphenoxy propionate (APP) and cyclohexanedione (CHD) herbicides, including quizalofop-P, sethoxydim, and clethodim. Data recorded included plant-mortality counts and biomass. Tests revealed that the La Grande downy brome accession was highly resistant to fluazifop-P and sethoxydim at all tested rates. The La Grande accession suffered no mortality from fluazifop-P or sethoxydim treatments up to the maximum tested rate of eight times (8×) the labeled recommendation. The La Grande accession was resistant to quizalofop-P and clethodim at the labeled rate or less but was susceptible to application rates higher than the labeled rate. The control downy brome accession was completely susceptible to fluazifop-P, quizalofop-P, and clethodim at all rates and exhibited increasing susceptibility with increasing sethoxydim rate. This pattern of cross-resistance differs from that of a previously reported case of ACCase resistance in downy brome.

Keywords

Clethodimfluazifop-Pquizalofop-Psethoxydimdowny brome, Bromus tectorum L. BROTEcreeping red fescue, Festuca rubra L.Acetyl-coenzyme A carboxylaseherbicide resistancelipid biosynthesis inhibitorgraminicide
Type
Research Article
Information
Weed Science , Volume 55 , Issue 2 , April 2007 , pp. 91 - 94
Copyright
Copyright © Weed Science Society of America 

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