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Vapor Movement of Synthetic Auxin Herbicides: Aminocyclopyrachlor, Aminocyclopyrachlor-Methyl Ester, Dicamba, and Aminopyralid

Published online by Cambridge University Press:  20 January 2017

Stephen D. Strachan ,
Mark S. Casini ,
Kathleen M. Heldreth ,
Joseph A. Scocas ,
Scott J. Nissen ,
Bekir Bukun ,
R. Bradley Lindenmayer ,
Dale L. Shaner ,
Philip Westra  and
Galen Brunk
Stephen D. Strachan
Affiliation:
DuPont Stine–Haskell Research Center, 1090 Elkton Road, Newark, DE 19711
Mark S. Casini
Affiliation:
DuPont Stine–Haskell Research Center, 1090 Elkton Road, Newark, DE 19711
Kathleen M. Heldreth
Affiliation:
DuPont Stine–Haskell Research Center, 1090 Elkton Road, Newark, DE 19711
Joseph A. Scocas
Affiliation:
DuPont Stine–Haskell Research Center, 1090 Elkton Road, Newark, DE 19711
Scott J. Nissen*
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Bekir Bukun
Affiliation:
Department of Plant Protection, Harran University, Sanliurfa, Turkey
R. Bradley Lindenmayer
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Dale L. Shaner
Affiliation:
U.S. Department of Agriculture–Agricultural Research Service, Water Resources, Fort Collins, CO 80526
Philip Westra
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
Galen Brunk
Affiliation:
Department of Bioagricultural Sciences and Pest Management, Colorado State University, Fort Collins, CO 80523
*
Corresponding author's E-mail: snissen@lamar.colostate.edu
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Abstract

Aminocyclopyrachlor, a newly discovered synthetic auxin herbicide, and its methyl ester, appear to control a number of perennial broadleaf weeds. The potential volatility of this new herbicide and its methyl ester were determined under laboratory conditions and were also compared to dicamba and aminopyralid with the use of enclosed chamber and open-air plant bioassays. Bioassays consisting of visual estimates of epinastic responses and kidney bean and soybean leaf-width measurements were developed to measure vapor release from glass and plastic. Vapor release of aminocyclopyrachlor from glass surfaces was undetectable under laboratory conditions, and no phytotoxic responses were observed when plants were exposed to vapors emanating from various surfaces. Results were similar to those of aminopyralid, indicating the risk of plant injury from vapor movement of aminocyclopyrachlor and aminopyralid was very low. When combined with 1% methylated seed oil, vapor release of aminocyclopyrachlor-methyl ester reached 86% 192 h after application to glass surfaces. Phytotoxic responses of plants exposed to vapors emanating from various surfaces treated with aminocyclopyrachlor-methyl ester were similar to responses to dicamba under enclosed incubation conditions, but were less in outdoor, open-air environments. Studies are needed to understand better the risk of injury to nontarget plants due to vapor movement of aminocyclopyrachlor-methyl ester under field applications.

Keywords

Aminocyclopyrachloraminopyralidkidney bean, Phaseolus vulgaris, ‘Green potted bush’soybean, Glycine max (L.) Merr. ‘Pioneer 94B53’Auxinic herbicidesbioassayvapor driftvolatility
Type
Research Article
Information
Weed Science , Volume 58 , Issue 2 , June 2010 , pp. 103 - 108
Copyright
Copyright © Weed Science Society of America 

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