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Simulated Spray Drift of Aminocyclopyrachlor on Cantaloupe, Eggplant, and Cotton

Published online by Cambridge University Press:  20 January 2017

Michael L. Flessner ,
J. Scott McElroy ,
Leonildo A. Cardoso  and
Dagoberto Martins
Michael L. Flessner*
Affiliation:
Agronomy and Soils Department, Auburn University, 201 Funchess Hall, Auburn University, AL 36849
J. Scott McElroy
Affiliation:
Agronomy and Soils Department, Auburn University, 201 Funchess Hall, Auburn University, AL 36849
Leonildo A. Cardoso
Affiliation:
United Nations Food and Agriculture Organization, Institute for Biodiersity and Protected Areas, Av. Dom Settimio Arturo Ferrazzetta Cx P. 70 Bissau, Republic of Guinea-Bissau
Dagoberto Martins
Affiliation:
Vegetable Production Department, Agricultura Fazenda Experimental Lageado – Caixa Postal 237 Rua José Barbosa de Barros, 1780 – CEP, 18610–307 – Botucatu-SP/Brazil
*
Corresponding author's E-mail: [email protected].
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Abstract

Aminocyclopyrachlor (AMCP) is a herbicide with an auxin-mimic mode of action. AMCP is registered for use in the United States on right-of-way and other noncropland sites, causing concern for potential off-target spray drift. The objectives of this study were to evaluate cantaloupe and eggplant response to simulated AMCP spray drift in the field and cotton response in the greenhouse. Cantaloupe and eggplant responded with little to no injury from drift rates up to 10 g AMCP ha−1, roughly 3.2% of the maximum labeled use rate for right-of-way weed control. Slight yield reductions occurred but were not consistent between 2008 and 2009. Therefore, eggplant and cantaloupe injury and yield-reduction potential from AMCP spray drift is low. Cotton response to AMCP drift was compared to similar spray drift rates of 2,4-D and aminopyralid. Cotton responded with injury and reductions in height and dry mass from all three herbicides. Responses were greatest from AMCP, indicating AMCP is potentially more damaging to cotton than 2,4-D or aminopyralid if spray drift occurs, when comparing percentages of labeled rates.

Aminocyclopyrachlor (AMCP) es un herbicida con un modo de acción similar a las auxinas. AMCP está registrado en los Estados Unidos para el uso en bordes de caminos y en otros sitios no-agrícolas, lo que causa preocupación por el riesgo potencial de deriva hacia lugares no deseados. Los objetivos de este estudio fueron evaluar la respuesta del melón 'cantaloupe' y la berenjena a la deriva simulada de AMCP en el campo y la respuesta del algodón en el invernadero. El melón y la berenjena mostraron poco a ningún daño en respuesta a dosis de deriva de hasta 10 g AMCP ha−1, aproximadamente 3.2% de la dosis máxima de uso según la etiqueta para control de malezas en bordes de caminos. Ligeras reducciones en rendimiento ocurrieron, pero no fueron consistentes entre 2008 y 2009. De esta forma, el potencial daño y reducción en el rendimiento del melón y la berenjena producto de la deriva de AMCP es bajo. La respuesta del algodón a la deriva de AMCP fue comparable a dosis de deriva similares de 2,4-D y aminopyralid. El algodón respondió con daño y reducciones en altura y materia seca a los tres herbicidas. Las respuestas fueron mayores a AMCP, indicando que AMCP es potencialmente más dañino al algodón que 2,4-D o aminopyralid, si ocurre deriva cuando se comparan porcentajes de las dosis de etiqueta.

Keywords

Aminocyclopyrachlorcantaloupe, Cucumis melo L. ‘Athena'cotton, Gossypium hirsutum L. ‘PHY 375 WRF'eggplant, Solanum melongena L. ‘Fairy Tale’2,4-Daminopyralidoff-target movementsynthetic auxin herbicide
Type
Weed Management—Other Crops/AREAS
Information
Weed Technology , Volume 26 , Issue 4 , December 2012 , pp. 724 - 730
Copyright
Copyright © Weed Science Society of America 

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