Australian glyphosate-resistant barnyard grass fear:
Experts are warning Australian farmers to monitor the control of barnyard grass (Echinochloa crus-galli) following the world's first suspected case of resistance to the herbicide, glyphosate. The New South Wales Department of Primary Industries is advising growers to check barnyard grass that has survived one or more applications of glyphosate and to provide seed for resistance testing. It is warning farmers not to rely solely on glyphosate to control the weed, but to use paraquat or paraquat/diquat combinations. The suspected case of resistance occurred in a field that had received 15-20 applications of glyphosate over a five-year period. The DPI plans to conduct field tests to determine management options for resistant barnyard grass populations.