The preliminary report of a fungus pathogen causing the rice brown streak leaf spot

In this study,we performed the isolation and identification of the pathogen of rice brown streak leaf spot which occurs commonly in Guangdong cropping area in recent years.According to Koch's rule,we identified the causative pathogen which is 〔Nigrospora oryzae(Berk.et Br.) petch〕.Its symptoms similar to rice narrow spot disease,mainly observed in the late growing stage of rice,short thin strips spots were formed on the leaf surface from tan to dark brown.The severe disease could cause the withered of whole leaf and ear,as well as the poor seeds production,and then the yield of rice can be severe reduced.Here we made a description of the disease symptoms and the pathogen identification which occurred on the mainly planted rice cultivars in Guangdong.Further,we reviewed the occurrence and the control condition of the pathogens on different hosts at China and abroad.