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Potato Response to Simulated Glyphosate Drift

Published online by Cambridge University Press:  20 January 2017

Joel Felix*
Affiliation:
Oregon State University/Malheur Experiment Station, 595 Onion Ave., Ontario, OR 97914
Rick Boydston
Affiliation:
Agricultural Research Service, United States Department of Agriculture, Irrigated Agriculture Research and Extension Center, Prosser, WA 99350-9687
Ian C. Burke
Affiliation:
Washington State University, 163 Johnson Hall, P.O. Box 646420, Pullman, WA 99164-6420
*
Corresponding author's E-mail: [email protected]

Abstract

Field studies were conducted in 2008 in Ontario, OR and Paterson, WA to determine the effect of simulated glyphosate drift on ‘Ranger Russet’ potato, including visual injury, shikimic acid accumulation, and tuber yield. Glyphosate was applied at 8.5, 54, 107, 215, and 423 g ae ha−1; which corresponds to 0.01, 0.064, 0.126, 0.254, and 0.5 of the lowest recommended (846 g ha−1) single application dose for glyphosate-resistant corn and sugar beet. Glyphosate was applied when potato plants were at 10-cm height, stolon hooking, tuber initiation, or bulking stage. The greatest visual foliar injury was observed when glyphosate was applied at a dose of 54 g ha−1 or greater and potato plants were at the hooking stage. The lowest foliar injury was observed when glyphosate was applied to potato plants at the bulking stage. The I50 glyphosate dose at 42 d after treatment (DAT) was estimated to be 167 g ha−1 for potatoes sprayed at the hooking stage. The corresponding glyphosate dose to result in 50% injury for potatoes sprayed at tuber initiation, 10-cm height, and bulking stages were 129%, 338%, and 438%, respectively, greater than hooking stage. The U.S. No.1 potato yield was inversely related to vine injury and shikimic acid accumulation. Shikimic acid accumulation increased when glyphosate was applied at 107 g ha−1 or greater. U.S. No.1 potato yield was reduced by 46% and 84% relative to the untreated control (55 and 76 T/ha) when glyphosate was applied at 107 g ha−1 to plants in the hooking stage at Ontario and Paterson, respectively. Tuber yields at both sites were lowest when glyphosate was applied at hooking and tuber initiation stages.

En 2008 se realizaron estudios de campo en Ontario, OR y Paterson, WA para determinar el efecto de la diseminación o rociado no intencional de glifosato en el daño de papa ‘Ranger Russet’, en la acumulación del ácido shikímico y en el rendimiento del tubérculo. El glifosato fue aplicado a 8.5, 54, 107, 215 y 423 g ea ha−1, lo que corresponde a 0.01, 0.064, 0.126, 0.254 y 0.5 de la dosis más baja recomendada (846 g ha−1) en una sola aplicación para maíz y remolacha azucarera resistentes a glifosato. El glifosato fue aplicado cuando las plantas de papa tenían: 10 cm de altura, iniciación temprana del tubérculo, iniciación del tubérculo y etapa de ensanchamiento del tubérculo. El mayor daño foliar fue registrado cuando el glifosato se aplicó a una dosis mayor o igual a 54g ha−1 y cuando las plantas estaban en la etapa de iniciación temprana del tubérculo. El menor daño foliar fue observado cuando el glifosato se aplicó a las plantas en la etapa de ensanchamiento del tubérculo. La dosis I50 de glifosato a 42 DAT, fue estimada a ser 167 g ha−1 para papas rociadas en la etapa de iniciación temprana del tubérculo. Las dosis de glifosato que resultaron en un daño del 50% para plantas rociadas en las etapas de iniciación del tubérculo, de10 cm de altura y en la etapa de ensanchamiento del tubérculo fueron 129%, 338% y 438% mayores que en la etapa de iniciación temprana del tubérculo. El rendimiento de la papa U.S. No. 1 fue inversamente relacionado al daño de la enredadera y a la acumulación de ácido shikímico. La acumulación de ácido shikímico aumentó cuando el glifosato fue aplicado igual o mayor a 107 g ha−1. El rendimiento de la papa U.S. No. 1 se redujo en 46 y 84% en relación con el testigo no tratado (55 y 76 T/ha) cuando el glifosato fue aplicado en 107 g ha−1 a plantas en la etapa de iniciación temprana del tubérculo en Ontario y Paterson, respectivamente. Los rendimientos del tubérculo en ambos sitios fueron los más bajos cuando el glifosato se aplicó en las etapas de iniciación temprana del tubérculo y de iniciación de tubérculo.

Type
Weed Management—Other Crops/Areas
Copyright
Copyright © Weed Science Society of America 

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