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Herbicide Application Strategies for the Control of Rigid Ryegrass (Lolium rigidum) in Wide-Row Faba Bean (Vicia faba) in Southern Australia

Published online by Cambridge University Press:  20 January 2017

Samuel G. L. Kleemann*
Affiliation:
School of Agriculture, Food, and Wine, The University of Adelaide, South Australia, Australia 5064
Gurjeet S. Gill
Affiliation:
School of Agriculture, Food, and Wine, The University of Adelaide, South Australia, Australia 5064
*
Corresponding author's E-mail: samuel.kleemann@adelaide.edu.au

Abstract

Two field experiments were undertaken at Roseworthy, South Australia from 2006 to 2007 to evaluate the performance of herbicide application strategies for the control of herbicide-resistant rigid ryegrass in faba bean grown in wide rows (WR). The standard farmer practice of applying postsowing PRE (PSPE) simazine followed by POST clethodim to faba bean grown in WR provided consistent and high levels of rigid ryegrass control (≥ 96%) and caused a large reduction (P < 0.05) in spike production (≤ 20 spikes m−2) as compared with nontreated control (560 to 722 spikes m−2). Furthermore, this herbicide combination resulted in greatest yield benefits for WR faba bean (723 to 1,046 kg ha−1). Although PSPE propyzamide used in combination with shielded interrow applications of glyphosate or paraquat provided high levels of rigid ryegrass control (≥ 93%), these treatments were unable to reduce ryegrass spike density within the crop row (20 to 54 spikes m−2) to levels acceptable for continued cropping. Furthermore, a yield reduction (13 to 29%) was observed for faba bean in treatments with shielded application of nonselective herbicides and could be related to spray drift onto lower leaves. These findings highlight that shielded interrow spraying in WR faba bean could play an important role in the management of rigid ryegrass in southern Australia. However, timing of shielded interrow applications on weed control, crop safety, and issues concerning integration with more effective early-season control strategies require attention.

De 2006 a 2007, dos experimentos de campo fueron realizados en Roseworthy, al sur de Australia, para evaluar el desempeño de estrategias de aplicación de herbicidas en el control de Lolium rigidum resistente a herbicidas en frijol faba, cultivado en surcos anchos (WR). La práctica estándar de los agricultores de aplicar simazine después de la siembra PRE emergente (PSPE) seguido por clethodim POS emergente (POST) al frijol faba cultivado en WR, proporcionó niveles altos y consistentes de control de L. rigidum (≥96%) y causó una gran reducción (P<0.05) en producción de espigas (≤20 espigas m−2), cuando se comparó con el testigo no tratado (de 560 a 722 espigas m−2). Además, esta combinación de herbicidas proporcionó mayores beneficios en el rendimiento del frijol WR (de 723 a 1046 kg ha−1). Aunque cuando propyzamide PSPE usada en combinación con aplicaciones con pantalla entre surcos de glifosato o paraquat proporcionó altos niveles de control de L. rigidum (≥93%), estos tratamientos no pudieron reducir la densidad de espigas de L. rigidum dentro del surco del cultivo (de 20 a 54 espigas m−2) a niveles aceptables para la producción continua de cultivos. Además, una reducción del rendimiento de13 a 29% se observó en este cultivo en tratamientos con aplicación con pantalla de herbicidas no selectivos, la cual podría estar relacionada a la aspersión no intencional de las hojas inferiores. Estos resultados resaltan que la aspersión con pantalla entre surcos en frijol faba WR podría jugar un papel importante en el manejo de L. rigidum al sur de Australia. Sin embargo, se debe prestar atención al tiempo de las aplicaciones con pantalla entre surcos en el control de malezas, la seguridad del cultivo y los asuntos concernientes a la integración de estrategias de control más eficaz temprano durante el ciclo productivo.

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

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