Library

Management Strategies for Preventing Herbicide-Resistant Grass Weeds in Clearfield Wheat Systems

Curtis Rainbolt, Daniel Ball, Donn Thill and, Joe Yenish (May, 2004)

Summary

The Clearfield (imidazolinone-resistant) winter wheat production system is currently available in the Pacific Northwest (PNW). Imazamox (Beyond), a group 2 (ALS inhibitor) herbicide, applied to Clearfield winter wheat provides an unprecedented opportunity to selectively control jointed goatgrass. The system can also be used to control other grass weeds, such as downy brome and wild oat. However, overuse of this technology will rapidly result in the selection of weed populations that are resistant to group 2 herbicides.