Abstract:

27 isolates belonging to 4 Chinese races of blast fungus,which wereisolated from japonica varieties in North China,were divided into 11races by using 9 Japanese differential varieties with single resistancegene in 1982.42 isolates,classified into 7 Chinese races,were determ-ined by 12 Kiyosawa’s differential varieties in 1983.The result indicatedthat 19 Japanese races were included in 42 isolates.It can be concludedthat kiyosawa’s differential varieties and Japanese ones have higher abi-lity differentiating...