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Postemergence Weed Control in Onion with Bentazon, Flumioxazin, and Oxyfluorfen

  • Chad M. Herrmann (a1), Margaret A. Goll (a1), Colin J. Phillippo (a1) and Bernard H. Zandstra (a1)

Abstract

Field experiments were conducted in 2008 and 2010 to determine crop tolerance and weed control efficacy of the POST herbicides bentazon, flumioxazin, and oxyfluorfen applied to direct-seeded dry bulb onions on organic soil. Postemergence application of oxyfluorfen at 0.071 kg ai ha−1 resulted in less than 20% onion injury when applied at the 2 and 4 onion leaf stages and provided good control of ladysthumb and common lambsquarters. Oxyfluorfen EC caused slightly higher visual injury than oxyfluorfen SC, but there was no difference in onion yield among the treatments. Application of flumioxazin at 0.036 of 0.072 kg ai ha−1 alone or in combination with pendimethalin ACS resulted in minimal onion injury and no yield reduction. Combining flumioxazin in a tank mix with pendimethalin EC, dimethenamid-P EC, or S-metolachlor EC resulted in significant onion injury and yield reduction. Flumioxazin plus S-metolachlor, dimethenamid-P, or pendimethalin improved ladysthumb control in one of two years. Bentazon applied at 0.56 kg ai ha−1 produced moderate onion injury and did not control yellow nutsedge adequately. Bentazon applied at 1.12 kg ai ha−1 provided good control of yellow nutsedge but caused serious onion injury and yield loss.

En 2008 y 2010 se realizaron experimentos de campo para determinar la tolerancia del cultivo y el control eficaz de malezas de los herbicidas POST bentazon, flumioxazin, y oxyfluorfen aplicados a bulbos secos de cebolla en siembra directa en un suelo orgánico. La aplicación en postemergencia de oxyfluorfen a 0.071 kg ai ha−1 resultó en menos de 20% de daño en la cebolla cuando se aplicó en los estadios de la cebolla de 2 y 4 hojas, además brindó buen control de Polygonum persicaria y Chenopodium album. Oxyfluorfen EC causó un daño visual ligeramente mayor que oxyfluorfen SC, pero no hubo diferencias en el rendimiento de la cebolla entre ambos tratamientos. La aplicación de flumioxazin a 0.036 ó 0.072 kg ai ha−1 sólo o en combinación con pendimethalin ACS resultó en un daño mínimo a la cebolla sin ninguna reducción en el rendimiento. La combinación en mezclas en tanque de flumioxazin con pendimethalin EC, dimethenamid-P EC, o S-metolachlor EC resultó en un daño significativo a la cebolla y en reducción del rendimiento. Flumioxazin más S-metolachlor, dimethenamid-P, o pendimethalin mejoraron el control de P. persicaria en uno de los dos años. Bentazon aplicado a 0.56 kg ai ha−1 produjo un daño moderado a la cebolla y no controló Cyperus esculentus adecuadamente. Bentazon aplicado a 1.12 kg ai ha−1 brindó buen control de C. esculentus, pero causó serios daños y pérdida de rendimiento en la cebolla.

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*Corresponding author’s E-mail: zandstra@msu.edu

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Associate Editor for this paper: Robert Nurse, Agriculture and Agri-Food Canada

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References

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