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Italian Ryegrass (Lolium perenne) Control and Winter Wheat Response to POST Herbicides

  • Timothy L. Grey (a1), George S. Cutts (a2), Lynn Sosnoskie (a3) and A. Stanley Culpepper (a1)

Abstract

Field studies were conducted to evaluate Italian ryegrass control and winter wheat tolerance to applications of diclofop, mesosulfuron plus methylated seed oil (MSO) alone or with 30% urea ammonium nitrate (UAN), mesosulfuron plus thifensulfuron plus tribenuron plus MSO, mesosulfuron plus MCPA plus MSO, or flufenacet plus metribuzin. Treatments were applied to wheat PRE, two- to three-leaf wheat (2–3 LF) at Feekes stage 1.0 or to one- to two-tiller wheat (TILL) at Feekes stage 3.0, depending on label recommendations. Studies were conducted in Williamson, GA, and Plains, GA, from autumn 2003 to spring 2005. Italian ryegrass control was variable, depending on location and year. Maximum and most-consistent Italian ryegrass control (> 90%) occurred with mesosulfuron plus MSO and UAN. Without UAN, control of Italian ryegrass with mesosulfuron varied from 44 to 97%. That variability was partially attributed to unfavorable environmental conditions associated with cold night time temperatures at or below 0 C, following applications. Wheat injury observed in response to herbicide treatments was minimal (< 15%) and transient; wheat recovered with no differences in yield.

Se realizaron estudios de campo para evaluar el control de Lolium perenne ssp. multiflorum y la tolerancia del trigo de invierno a aplicaciones de diclofop, mesosulfuron más aceite de semilla metilado (MSO) solo o con 30% urea ammonium nitrate (UAN), mesosulfuron más thifensuluron más tribenuron más MSO, mesosulfuron más MCPA más MSO o flufenacet más metribuzin. Los tratamientos se aplicaron al trigo en PRE, a dos a tres hojas del trigo (2–3 LF) en el estado Feekes 1.0 o a uno a dos hijuelos (TILL) en el estado Feekes 3.0, dependiendo de las recomendaciones de las etiquetas. Los estudios se realizaron en Williamson, GA y en Plains, GA, desde el otoño de 2003 a la primavera de 2005. El control de L. perenne fue variable dependiendo del sitio y el año. El máximo control (>90%) se dio con mesosulfuron más MSO y UAN. Sin UAN, el control de L. perenne con mesosulfuron varió entre 47% y 97%. La variabilidad fue parcialmente atribuida a condiciones ambientales desfavorables asociadas a temperaturas nocturnas de 0 C o inferiores, después de las aplicaciones. El daño observado en el trigo en respuesta a los tratamientos con herbicidas fue mínimo (<15%) y transitorio. El trigo se recuperó y no hubo diferencias en rendimiento.

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Corresponding author

Corresponding author's E-mail: tgrey@uga.edu

References

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