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Influence of Application Method and Chemical Form on the Absorption and Translocation of Aminocyclopyrachlor in Black Walnut

Published online by Cambridge University Press:  20 January 2017

Nevin C. Lawrence*
Affiliation:
Department of Crop and Soil Sciences, Johnson Hall rm. 113, Washington State University, Pullman, WA 99163-6420
Jared L. Bell
Affiliation:
Dow AgroSciences LLC, 9330 Zionsville Rd., Indianapolis, IN 46268
Ian C. Burke
Affiliation:
Department of Crop and Soil Sciences, Johnson Hall rm. 113, Washington State University, Pullman, WA 99163-6420
*
Corresponding author's E-mail: [email protected].

Abstract

Absorption and translocation of aminocyclopyrachlor (AMCP) was investigated in black walnut. Radiolabeled AMCP was applied foliarly as a free acid, and basally as a free-acid-formulated oil-soluble liquid and as a methyl ester emusifiable concentrate. Maximum absorption was 68% for the methyl ester, 47% for the free-acid oil-soluble liquid, and 8% for the free acid when evaluated as percent applied. When recovered AMCP was presented as Bq g−1, no difference was observed in AMCP absorption or translocation of 14C-labeled material out of treated plant parts. Recovery of applied radiolabeled material in the roots from basal applications was 5 to 11% 72 h after treatment (HAT), compared with 0.8% recovery from a foliar application. Regardless of chemical form or formulation type, comparable injury was observed within 72 HAT despite low levels of translocation.

Type
Physiology/Chemistry/Biochemistry
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Franck E. Dayan, USDA-ARS.

References

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