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Effect of Application Timing on Winter Wheat Response to Metribuzin

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Metribuzin will control many problematic weed species in winter wheat in the mid-Atlantic states, including herbicide-resistant biotypes, but it has not been recommended due to crop safety concerns. In a… Click to show full abstract

Metribuzin will control many problematic weed species in winter wheat in the mid-Atlantic states, including herbicide-resistant biotypes, but it has not been recommended due to crop safety concerns. In a three-year trial, metribuzin was applied at 105 or 210 g ai ha−1 to wheat at the PRE, 2-leaf (Feekes stage 1 to 2), early spring (Feekes stage 3 to 4), and late spring (Feekes stage 4 to 6) growth stages using wheat cultivars sensitive to metribuzin. Early spring applications had the least amount of injury, and injury at this timing was transient and yield was not reduced. Yield loss was observed with the other application timings in at least one out of three years. Rainfall shortly after application appears to increase the risk of wheat injury. Nomenclature: metribuzin; wheat, Triticum aestivum L. Metribuzin controlará muchas especies de malezas problemáticas en trigo de invierno en los estados del Atlántico medio, incluyendo biotipos resistentes a herbicidas, pero no ha sido recomendado debido a preocupación sobre su seguridad en el cultivo. En un ensayo durante tres años, se aplicó metribuzin a 105 ó 210 g ai ha−1 al trigo en los estadios de crecimiento PRE, 2-hojas (estadios Feekes 1 a 2), temprano en la primavera (estadios Feekes 3 a 4), y tarde en la primavera (estadios Feekes 4 a 6) usando cultivares de trigo sensibles a metribuzin. Las aplicaciones temprano en la primavera tuvieron la menor magnitud de daño, y el daño en este momento de aplicación fue temporal y el rendimiento no se redujo. Se observó pérdida en el rendimiento con otros momentos de aplicación en uno de los tres años. Eventos de lluvia poco después de las aplicaciones parecen aumentar el riesgo de daño en el trigo.

Keywords: metribuzin; winter wheat; wheat; feekes stage; application; estadios feekes

Journal Title: Weed Technology
Year Published: 2017

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