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Evaluation of Tribenuron-Methyl on Sulfonylurea-Resistant Lettuce Germplasm

Published online by Cambridge University Press:  20 January 2017

Jayesh B. Samtani
Affiliation:
Hampton Roads AREC, Department of Horticulture, Virginia Polytechnic Institute and State University, 1444 Diamond Springs Road, Virginia Beach, VA 23455
John S. Rachuy
Affiliation:
Department of Plant Sciences, University of California, Davis, 1636 E. Alisal Street, Salinas, CA 93905
Beiquan Mou
Affiliation:
USDA-ARS, 1636 E. Alisal Street, Salinas, CA 93905
Steven A. Fennimore*
Affiliation:
Department of Plant Sciences, University of California, Davis, 1636 E. Alisal Street, Salinas, CA 93905
*
Corresponding author's E-mail: safennimore@ucdavis.edu.

Abstract

A sulfonylurea (SU) herbicide resistance allele discovered in prickly lettuce was previously transferred to domestic lettuce with the cultivar name ‘ID-BR1’. ID-BR1 was acquired, and the SU resistance allele was transferred through traditional breeding methods to five common commercial lettuce types: butterhead, crisphead, green leaf, red leaf, and romaine. Field trials were conducted at Salinas, CA during 2011 and 2012 to evaluate POST applications of tribenuron-methyl (tribenuron) on SU-susceptible and SU-resistant lettuce types. Treatments included a nontreated control, pronamide applied PRE at 1,340 g ai ha−1, and tribenuron at 4, 9, and 17 g ai ha−1 applied POST. Data collected were: weed control, crop injury estimates (0 = safe, 100 = dead), stand counts, and lettuce yields. Injury to lettuce from tribenuron was high in SU-susceptible lettuce types and low in SU-resistant accessions. With the exceptions of a romaine lettuce line that still may have some susceptible individuals, tribenuron did not reduce yield of SU-resistant lettuce, but did reduce the yield of SU-susceptible lettuce. Suppression of weeds such as common groundsel and annual sowthistle was higher with tribenuron than with pronamide. Tribenuron should be considered for registration as a lettuce herbicide for SU-resistant lettuce to improve current weed management options for that crop.

Un alelo de resistencia a herbicidas del grupo sulfonylurea (SU) que había sido descubierto en Lactuca serriola y que fue previamente transferido al cultivar ‘ID-BR1’ de lechuga doméstica. ID-BR1 fue adquirido, y el alelo de resistencia a SU fue transferido mediante métodos tradicionales de mejoramiento genético a cinco tipos de lechuga comercial: butterhead, crisphead, green leaf, red leaf, y romaine. Se realizaron experimentos de campo en Salinas, CA durante 2011 y 2012 para evaluar aplicaciones POST de tribenuron-methyl (tribenuron) sobre tipos de lechuga SU-susceptibles y SU-resistentes. Los tratamientos incluyeron un testigo no-tratado, pronamide aplicado PRE a 1,340 g ai ha−1, y tribenuron a 4, 9, y 17 g ai ha−1 aplicado POST. Los datos colectados fueron: control de malezas, estimados de daño en el cultivo (0 = seguro, 100 = muerto), conteos de plantas del cultivo establecidas, y rendimientos de la lechuga. El daño en la lechuga producido por tribenuron fue alto en los tipos de lechuga SU-susceptible y bajo en las accesiones SU-resistentes. Con las excepciones de una línea de lechuga romaine que todavía podría tener algunos individuos susceptibles, tribenuron no redujo el rendimiento de lechuga SU-resistente, pero sí redujo el rendimiento de lechuga SU-susceptible. La supresión de malezas tales como Senecio vulgaris y Sonchus oleraceus fue mayor con tribenuron que con pronamide. Tribenuron debería ser considerado para ser registrado como herbicida para lechuga SU-resistente para mejorar las opciones de manejo actuales para ese cultivo.

Information

Type
Research Article
Copyright
Copyright © Weed Science Society of America 

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