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Effect of Simulated Aminocyclopyrachlor Drift on Flue-Cured Tobacco

Published online by Cambridge University Press:  20 January 2017

D. F. Lewis ,
S. T. Hoyle ,
L. R. Fisher ,
F. H. Yelverton  and
R. J. Richardson
D. F. Lewis*
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
S. T. Hoyle
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
L. R. Fisher
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
F. H. Yelverton
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
R. J. Richardson
Affiliation:
Crop Science Department, P.O. Box 7620, North Carolina State University, Raleigh, NC 27695-7620
*
Corresponding author's E-mail: [email protected]
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Abstract

Flue-cured tobacco is sensitive to foliar and soil residues of off-target synthetic auxin drift. Aminocyclopyrachlor is a newly developed synthetic auxin herbicide that may be used in right-of-way applications for broadleaf weed and brush control. Aminocyclopyrachlor is considered a reduced-risk alternative in rights-of-way compared with similar compounds because of its low application rate and volatility risk. However, no research is available on the response of field-grown, flue-cured tobacco to aminocyclopyrachlor drift exposure. Research was conducted in 2009 and 2010 at the Border Belt Tobacco Research Station in Whiteville, NC, to determine the response of ‘NC 71’ flue-cured tobacco to five simulated drift rates of aminocyclopyrachlor (0.31, 1.6, 3.1, 15.7, and 31.4 g ae ha−1) and one aminopyralid (6.1 g ae ha−1) simulated drift rates applied pretransplant incorporated, pretransplant unincorporated, 3 wk after transplant, and 6 wk after transplant. All herbicide rates and application timings caused significant visual tobacco injury, ranging from slight to severe with increasing herbicide drift rates. Tobacco plant heights and fresh weights were reduced at all application timings receiving ≥ 15.7 g ha−1 aminocyclopyrachlor and the comparative aminopyralid rate.

El tabaco curado en chimenea es sensible a residuos foliares y de suelo de deriva de aplicaciones de auxinas sintéticas. Aminocyclopyrachlor es una auxina sintética recién desarrollada que puede ser utilizada para controlar malezas de hoja ancha y matorrales en las orillas de los caminos. Se considera como una alternativa de menor riesgo comparada con otros compuestos similares para aplicaciones realizadas en las orillas de los caminos, debido a su baja dosis de aplicación y menor riesgo de volatilidad. Sin embargo, no se dispone de ninguna investigación acerca de la respuesta de este tipo de tabaco a los efectos causados por la exposición por deriva de aminocyclopyrachlor. Se realizó una investigación en 2009 y 2010 en Border Belt Tobacco Research Station en Whiteville, NC para determinar la respuesta del tabaco ‘NC 71’ a cinco concentraciones de deriva simuladas de aminocyclopyrachlor (0.31, 1.6, 3.1, 15.7 y 31.4 g ea ha−1) y una de aminopyralid (6.1 g ea ha−1), aplicadas en pre-transplante incorporado, pre-transplante no incorporado y tres y seis semanas pos-transplante. Todas las dosis de herbicida y momentos de aplicación causaron daño visual significativo al tabaco, variando de ligero a severo con dosis de deriva mayores. Se disminuyó la altura de las plantas y el peso fresco de las hojas en todos los momentos de aplicación con ≥15.7 g ha−1 de aminocyclopyrachlor y una dosis comparativa de aminopyralid.

Keywords

Aminocyclopyrachlor, 6-amino-5-chloro-2-cyclopropyl-4-pyrimidine-carboxylic acidaminopyralid 4-amino-3,6-dichloro-2-pyridinecarboxylic acidtobacco, Nicotiana tabacum L. ‘NC-71’Off-target movementsynthetic auxin
Type
Weed Management—Other Crops/Areas
Information
Weed Technology , Volume 25 , Issue 4 , December 2011 , pp. 609 - 615
Copyright
Copyright © Weed Science Society of America 

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