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Weed Management in Transplanted Lettuce with Pendimethalin and S-Metolachlor

Published online by Cambridge University Press:  20 January 2017

Ran N. Lati ,
Beiquan Mou ,
John S. Rachuy ,
Richard F. Smith ,
Surendra K. Dara ,
Oleg Daugovish  and
Steven A. Fennimore
Ran N. Lati*
Affiliation:
University of California, Davis, Department of Plant Sciences, 1636 East Alisal, Salinas, CA 93905
Beiquan Mou
Affiliation:
U.S. Department of Agriculture, Agricultural Research Service, 1636 East Alisal Street, Salinas, CA 93905
John S. Rachuy
Affiliation:
University of California, Davis, Department of Plant Sciences, 1636 East Alisal, Salinas, CA 93905
Richard F. Smith
Affiliation:
University of California Cooperative Extension, Monterey County, 1432 Abbott Street, Salinas, CA 93901
Surendra K. Dara
Affiliation:
University of California Cooperative Extension, San Luis Obispo County, 2156 Sierra Way, San Luis Obispo, CA 93401
Oleg Daugovish
Affiliation:
University of California Cooperative Extension, Ventura County, 669 County Square Drive, #100, Ventura, CA 93003
Steven A. Fennimore
Affiliation:
University of California, Davis, Department of Plant Sciences, 1636 East Alisal, Salinas, CA 93905
*
Corresponding author's E-mail: ranlati@ucdavis.edu.
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Abstract

Few herbicides are available for use in lettuce and hand weeding is required for commercially acceptable weed control. More effective herbicides are needed. Here field evaluations of pendimethalin and S-metolachlor for weed control in transplanted lettuce are reported. Pendimethalin was evaluated PRE at rates between 0.6 and 6.7 kg ai ha−1, and POST at 1.1 and 2.2 kg ha−1. Both pendimethalin PRE and POST applications were safe to transplanted lettuce and provided similar weed control. Pendimethalin PRE at rates of 1.1 kg ha−1 and higher provided better weed control than the industry standard, pronamide at 1.3 kg ha−1. S-Metolachlor PRE was evaluated at rates between 0.6 and 5.6 kg ha−1. S-Metolachlor at rates up to 2.8 kg ha−1 caused little or no crop injury or yield reduction in transplanted lettuce, and S-metolachlor at rates of 1.4 kg ha−1 and higher improved weed control compared with pronamide at 1.3 kg ha−1. Pendimethalin and S-metolachlor are not labeled for transplanted lettuce, but we suggest that labeling be pursued at rates of 1.1 and 0.7 kg ha−1, respectively. Pendimethalin at 1.1 kg ha−1 applied PRE or POST improved weed control by 57 and 42%, respectively compared with pronamide. S-Metolachlor PRE at 0.7 kg ha−1 was less effective on weeds than pendimethalin, but maintained weed control level similar to pronamide. Pendimethalin and S-metolachlor have potential for use in transplanted lettuce production and provide alternatives to current transplanted lettuce herbicides.

Hay pocos herbicidas disponibles para uso en lechuga y esto hace que la deshierba manual sea requerida para un control aceptable de malezas a nivel comercial. Se necesitan herbicidas más efectivos. Aquí se reportan evaluaciones de campo de pendimethalin y S-metolachlor para el control de malezas en lechuga trasplantada. Se evaluó pendimethalin PRE en dosis entre 0.6 y 6.7 kg ai ha−1, y POST a 1.1 y 2.2 kg ha−1. Ambas aplicaciones, PRE and POST, fueron seguras en la lechuga trasplantada y brindaron un control de malezas similar. Pendimethalin PRE a dosis de 1.1. kg ha−1 o mayores brindaron mejor control de malezas que el estándar de la industria, pronamide a 1.3 kg ha−1. S-metolachlor PRE fue evaluado a dosis entre 0.6 y 5.6 kg ha−1. S-metolachlor a dosis de hasta 2.8 kg ha−1 causó poco o nada de daño y no redujo el rendimiento de la lechuga trasplantada, y S-metolachlor a dosis de 1.4 kg ha−1 o mayores mejoraron el control de malezas al compararse con pronamide a 1.3 kg ha−1. Pendimethalin y S-metolachlor no están registrados para lechuga trasplantada, pero nosotros sugerimos que se debe tratar de registrarlos a dosis de 1.1. y 0.7 kg ha−1, respectivamente. Pendimethalin a 1.1 kg ha−1 aplicado PRE o POST mejoró el control de malezas en 57 y 42%, respectivamente al compararse con pronamide. S-metolachlor PRE a 0.7 kg ha−1 fue menos efectivo para el control de malezas que pendimethalin, pero mantuvo el control de malezas a un nivel similar a pronamide. Pendimethalin y S-metolachlor tienen el potencial para ser usados en la producción de lechuga con trasplante y así brindar alternativas a los herbicidas actualmente disponibles en este cultivo.

Keywords

PendimethalinpronamideS-metolachlorlettuce, Lactuca sativa L. var.Lettuce yieldPOSTPREweed control in transplanted lettuce
Type
Research Article
Information
Weed Technology , Volume 29 , Issue 4 , December 2015 , pp. 827 - 834
Copyright
Copyright © Weed Science Society of America 

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Footnotes

Associate Editor for this paper: Wiley Carroll Johnson III, USDA-ARS.

References

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