WEED CONTROL COMPOSITIONS CONTAINING DRECHSLERA - SPP. OR METABOLITE THEREOF AND WEED CONTROL METHODS USING DRECHSLERA SPP. OR METABOLITE THEREOF

摘要

Certain new strains of Drechslera spp. have been found as pathogens effective for the control of barnyard grass (Echinochloa), a troublesome grass, in the cultivation of economic crops such as rice and wheat. Weed control compositions containing living fungal cells of one of such strains or a metabolite of the strain and weed control methods using the microorganism or the metabolite of Drechslera spp. thereof are provided. The present invention has made it possible to control barnyard grass without adversely affecting economic crops. Further, the pathogens useful in the practice of this invention are free of the potential problem of environmental contamination inherent to synthesized organic herbicides and can be used safely.