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Greenhouse Assessment of Differences in Clomazone Tolerance among Sweetpotato Cultivars

Published online by Cambridge University Press:  20 January 2017

H. F. Harrison Jr.  and
D. M. Jackson
H. F. Harrison Jr.*
Affiliation:
U.S. Vegetable Laboratory, U.S. Department of Agriculture, Agricultural Research Service, 2700 Savannah Highway, Charleston, SC 29414
D. M. Jackson
Affiliation:
U.S. Vegetable Laboratory, U.S. Department of Agriculture, Agricultural Research Service, 2700 Savannah Highway, Charleston, SC 29414
*
Corresponding author's E-mail: howard.harrison@ars.usda.gov
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Abstract

Differences in clomazone tolerance among sweetpotato cultivars were first observed in April 2007 after use of the herbicide for weed control in fields containing the sweetpotato breeding project at the U.S. Vegetable Laboratory. Susceptible cultivars and experimental clones exhibited severe foliar chlorosis and reduced growth, whereas the most tolerant were not injured. Twelve cultivars and experimental clones were included in a greenhouse experiment to quantify the differences in clomazone tolerance. In the greenhouse, the clomazone concentration that caused moderate injury or reduction in shoot growth to the most tolerant clones was approximately 10 times the concentration that caused a similar response in the most susceptible clones. Two older cultivars, Excel and Sumor, that were developed before the registration of clomazone for use in sweetpotato were susceptible. Clomazone is an important component in sweetpotato weed management, and susceptibility is an undesirable trait that should be avoided in new sweetpotato cultivars.

Las diferencias de la tolerancia al clomazone entre los cultivares de camote se observaron por primera vez en abril de 2007, después del uso del herbicida para el control de malezas en campos donde se realizó el proyecto de mejoramiento del camote en el U.S. Vegetable Laboratory. Los cultivares susceptibles y clones experimentales mostraron clorosis foliar severa y crecimiento reducido, mientras que los más tolerantes no se dañaron. Doce cultivares y clones experimentales se incluyeron en un ensayo de invernadero para cuantificar las diferencias en la tolerancia al clomazone. En el invernadero, la concentración de clomazone que causó un daño moderado o reducción en el crecimiento de los brotes en los clones más tolerantes, fue aproximadamente 10 veces la concentración que causó una respuesta similar en los clones más susceptibles. Resultaron susceptibles dos de los cultivares más antiguos, Excel y Sumor, que fueron desarrollados antes del registro de clomazone para usar en el camote. Clomazone es un componente importante en el manejo de malezas en el cultivo de camote y su susceptibilidad es un rasgo no deseable que debe evitarse en los nuevos cultivares de camote.

Keywords

Clomazonesweetpotato, Ipomoea batatas (L.) LamHerbicide toleranceinjurysusceptibility
Type
Notes
Information
Weed Technology , Volume 25 , Issue 3 , September 2011 , pp. 501 - 505
Copyright
Copyright © Weed Science Society of America 

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