Ryegrass in almond orchards found to the glyphosate resistant, a management perspective

摘要

In 1996 in Australia, a weedy biotype of annual rye-grass (Lolium rigidum) survived labeled rates of glyphosate, the active ingredient in Roundup herbicide. After examination of thousands of samples, only four locations were confirmed as having theresistant population - indicating the phenomenon is not widespread. Monsanto and Charles Sturt University researchers embarked on a collaborative research project to better understand the mechanism of survival to glyphosate for this particular biotype ofryegrass. Results of these studies were presented by Dr. Jim Pratley, Professor of Weed Science at Charles Sturt University, at the Weed Science Society of America meeting in February, 1999. Observations include that the resistant ryegrass is easily controlled by tillage or other herbicides and the resistance is caused by a complex, inheritance pattern, unlikely to occur across a wide range of other species. It is worth mentioning that glyphosate remains an effective weed management tool in the areas where this resistant population was identified, for control of most weed species.