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1 November 2012 Response of Processing Tomato to Simulated Glyphosate Drift Followed by In-Crop Metribuzin Application
Kristen E. McNaughton, Peter H. Sikkema, Darren E. Robinson
Author Affiliations +
Abstract

Eight field studies were conducted over a 3-yr period from 2008 to 2010 in Ridgetown, Ontario, Canada, to determine the cumulative stress caused by simulated glyphosate spray drift followed by an in-crop application of metribuzin in processing tomato. As the simulated glyphosate spray drift rate increased so did the degree of injury to the tomatoes. At a simulated spray drift rate of 22.5 g ae ha−1 (2.5% of the recommended glyphosate field rate), a 23% decrease in red tomato yield was observed. Yield reductions increased to 88% of the control when 180 g ae ha−1 glyphosate (20% of the recommended field rate) was applied. Similarly when simulated spray drift rates were followed 3 to 5 d later with an in-crop application of metribuzin at 250 g ai ha−1, tomato yields decreased by 22 to 85% depending on glyphosate rate applied. A transient synergistic interaction was observed only when 22.5 g ae ha−1 glyphosate was followed by metribuzin. The synergistic response was no longer evident by the 28-d injury rating. Herbicide interactions were additive for crop injury, dry weight, fruit counts, and yield when glyphosate spray drift rates of 45, 90, or 180 g ae ha−1 were followed by metribuzin.

Nomenclature: Glyphosate; metribuzin; tomato, Solanum lycopersicon L.

Se realizaron ocho estudios de campo a lo largo de un periodo de 3 años desde 2008 a 2010 en Ridgetwon, Ontario, Canada, para determinar el estrés acumulativo causado por la deriva de aspersión simulada de glyphosate seguido de una aplicación dentro del cultivo de metribuzin en tomate para procesamiento. Al incrementarse la dosis de deriva simulada de glyphosate, se incrementó el nivel de daño en el tomate. A una dosis de deriva simulada de 22.5 g ae ha−1 (2.5% de la dosis de campo recomendada de glyphosate), se observó una disminución del 23% en el rendimiento de tomate rojo. Las reducciones en el rendimiento se incrementaron al 88% en comparación con el testigo cuando se aplicó glyphosate a 180 g ae ha−1 (20% de la dosis de campo recomendada). Similarmente, cuando la deriva simulada fue seguida de 3 a 5 días después con una aplicación dentro del cultivo de metribuzin a 250 g ai ha−1, los rendimientos del tomate disminuyeron 22 a 85% dependiendo de la dosis aplicada de glyphosate. Una interacción sinérgica transitoria se observó solamente cuando se aplicó glyphosate a 22.5 g ae ha−1 seguido por metribuzin. La respuesta sinérgica ya no fue evidente al momento de la evaluación de daño 28 días después del tratamiento. Las interacciones de herbicidas fueron aditivas para el daño del cultivo, peso seco, conteo de frutos y rendimiento cuando las dosis de aspersiones de deriva simulada de glyphosate fueron 45, 90 ó 180 g ae ha−1 y seguidas por metribuzin.

Kristen E. McNaughton, Peter H. Sikkema, and Darren E. Robinson "Response of Processing Tomato to Simulated Glyphosate Drift Followed by In-Crop Metribuzin Application," Weed Technology 26(4), 757-762, (1 November 2012). https://doi.org/10.1614/WT-D-12-00015.1
Received: 30 January 2012; Accepted: 1 July 2012; Published: 1 November 2012
KEYWORDS
Additive
cumulative stress
herbicide drift
Herbicide interaction
synergistic
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