New weapons on the way to battle wicked weeds

(American Chemical Society) A somber picture of the struggle against super-weeds emerged here today as scientists described the relentless spread of herbicide-resistant menaces like pigweed and horseweed that shrug off powerful herbicides and have forced farmers in some areas to return to hand-held hoes. The reports on herbicide resistance and its challenges to modern agriculture were part of a symposium at the 246th National Meeting & Exposition of the American Chemical Society.