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Resistance to Acetolactate Synthase and Acetyl Co-A Carboxylase Inhibitors in North Carolina Italian Ryegrass (Lolium perenne)
Published online by Cambridge University Press: 20 January 2017
Abstract
Diclofop-resistant Italian ryegrass is widespread in southwestern North Carolina, and growers have resorted to using acetolactate synthase (ALS) inhibitors such as mesosulfuron and pyroxsulam to control this weed in wheat. In the spring of 2007, mesosulfuron failed to control Italian ryegrass in several wheat fields. Seed were collected from six fields in two counties and greenhouse studies were conducted to determine response to mesosulfuron and the acetyl-CoA carboxylase (ACCase) inhibitors diclofop and pinoxaden. All populations were resistant to diclofop and cross-resistant to pinoxaden. Five of the six populations were resistant to diclofop, pinoxaden, and mesosulfuron. An additional study with two biotypes confirmed cross-resistance to the ALS inhibitors imazamox, mesosulfuron, and pyroxsulam. Resistance to mesosulfuron was heritable.
El Lolium perenne resistente al diclofop está ampliamente diseminado en el suroeste de Carolina del Norte y los productores han recurrido al uso de inhibidores del acetolactato (ALS), tales como mesosulfuron y pyroxsulam, para controlar esta maleza en el trigo. En la primavera de 2007, el mesosulfuron no logró controlar L. perenne en varios campos de este cereal. Se recolectaron semillas de seis campos en dos condados y se realizaron estudios de invernadero para determinar la respuesta a mesosulfuron y a los inhibidores de la acetil-CoA carboxilasa (ACCase), diclofop y pinoxaden. Todas las poblaciones mostraron resistencia a diclofop y resistencia cruzada a pinoxaden. Cinco de las seis poblaciones fueron resistentes al diclofop, pinoxaden y mesosulfuron. Un estudio adicional con dos biotipos confirmó la resistencia cruzada a los inhibidores ALS imazamox, mesosulfuron y pyroxsulam. La resistencia al mesosulfuron fue heredable.
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- Weed Biology and Competition
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- Copyright © Weed Science Society of America
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