Development of bioherbicides for control of barnyard grass in China.
Research progress on bioherbicides against barnyard grass in rice fields was reviewed with a focus on Chinese perspective. In China, barnyard grass is one of the most problematic weeds in paddy rice fields. Several fungal biocontrol agents have been studied extensively and the most promising candidates explored for commercial development, including strain selection and improvement, inoculum mass production, formulation, efficacy trials under various conditions, synergy with chemical herbicides, and safety to crops. Overall, mass production and formulation technologies have proved to be the major stumbling blocks that hinder bioherbicide development. Strategies are discussed to overcome the challenges and facilitate the development of selected fungal agents into commercial bioherbicide products.