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Drought Stress Reduces Fluazifop-P Activity on Green Foxtail (Setaria viridis)

Published online by Cambridge University Press:  12 June 2017

Rick A. Boydston
Rick A. Boydston*
Affiliation:
Plant Physiol., Agric. Res. Serv., U.S. Dep. Agric., Irrigated Agric. Res. and Ext. Ctr., Prosser, WA 99350
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Abstract

Although drought-stressing green foxtail before and up to 1 d after herbicide application did not reduce control with fluazifop-P in growth chamber trials, extending the drought stress for 2 to 4 d after herbicide application reduced control of green foxtail with fluazifop-P by 40 and 57%, respectively. Absorption and translocation of 14C-fluazifop-P 1, 4, and 10 d after herbicide application were similar between nonstressed and drought-stressed plants. Drought-stressed green foxtail converted slightly more of the parent acid of fluazifop-P to polar conjugates 4 d after herbicide application than did nonstressed plants, but these differences in metabolism were probably not adequate to explain large differences in efficacy.

Keywords

Fluazifop-P, (R)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl]-oxy]phenoxy]propanoic acidgreen foxtail, Setaris viridia (L.) Beauv. # SETVIAbsorptiontranslocationSETVI
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 40 , Issue 1 , March 1992 , pp. 20 - 24
Copyright
Copyright © 1992 by the Weed Science Society of America 

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