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Effects of Phenology on Translocation Patterns of Several Herbicides in Quackgrass, Agropyron repens

Published online by Cambridge University Press:  12 June 2017

K. Neil Harker  and
Jack Dekker
K. Neil Harker
Affiliation:
Crop Sci. Dep., Univ. Guelph, Ontario, Canada N1G 2W1
Jack Dekker
Affiliation:
Crop Sci. Dep., Univ. Guelph, Ontario, Canada N1G 2W1
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Abstract

A growth room study was conducted to evaluate the effect that timing of application has on the distribution of several herbicides in quackgrass. Uniformly labeled 14C-sucrose and the radiolabeled herbicides glyphosate, sethoxydim, the butyl ester of fluazifop, and the methyl ester of haloxyfop were applied to quackgrass (ranging from the three- to eight-leaf stage) propagated from six-bud rhizome segments. Five days after treatment the plants were harvested, lyophilized, and later sectioned, mapped, and oxidized in preparation for 14C quantification. In most cases, slightly more 14C was translocated to the shoots than to the rhizomes. 14C translocation to the rhizomes was similar at all growth stages. The 14C accumulating in the rhizomes exhibited a nonuniform distribution pattern with more 14C in the distal areas of new rhizomes than in the other areas of the rhizome system. Plants treated with haloxyfop had a more uniform distribution of 14C along their rhizomes than did those treated with fluazifop or sethoxydim.

Keywords

quackgrass, Agropyron repens (L.) Beauv. #3 AGRREsucrose, α-glucopyranosyl-β-D-fructo-furanosideglyphosate, N-(phosphonomethyl)glycinesethoxydim, 2-[1-(ethoxyimino)-butyl]-5-[2-(ethylthio)propyl]-3-hydroxy-2- cyclohexen-1-onefluazifop, (±)-2-[4-[[5-(trifluoromethyl)-2-pyridinyl] oxy] phenoxy] propanoic acidhaloxyfop, 2-[4-[[3-chloro-5-(trifluoromethyl)-2-pyridinyl] oxy] phenoxy] propanoic acidGrowth stagerhizomebudssucroseglyphosatesethoxydimfluazifophaloxyfopAGRRE
Type
Physiology, Chemistry, and Biochemistry
Information
Weed Science , Volume 36 , Issue 4 , July 1988 , pp. 463 - 472
Copyright
Copyright © 1988 by the Weed Science Society of America 

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