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09/07 - New Superweed Found in California
Hairy fleabane, a common summer annual in the south Central Valley, has joined the ranks of weeds that are resistant to glyphosate, an herbicide sold under the brand name Roundup. Researchers at USDA-ARS and UC Cooperative Extension recently reported the results from several locations in the Central Valley, and suspect that this resistant weed may be widespread on roadsides and in orchards and vineyards.
A few years ago, some populations of rigid ryegrass and horseweed were confirmed as glyphosate-resistant in California. Worldwide, 13 weed species are resistant to the herbicide.
The increased use of Roundup herbicide leading to weed resistance is a commonly acknowledged consequence associated with genetically engineered Roundup resistant crops.
The media contact for this story is: Anil Shrestha, IPM Weed Ecologist, (559) 646-6534, anil@uckac.edu