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近年来,浙江省在推广良种过程中,发现抗白叶枯病品种的抗性有严重丧失现象。杂交稻汕优6号,推广初期抗病性较强,1979年后,抗性明显下降;江苏省的南粳15,原属抗病品种,引入浙江种植后,发现对有些菌株感病。种种迹象表明,品种抗性不稳定性及其丧失与菌系变异有关。探明我省水稻白叶枯病区系分布和病菌分化,
In recent years, Zhejiang Province, in the promotion of improved varieties, found that resistance to bacterial blight varieties have a serious loss phenomenon. The resistance of hybrid rice Shanyou 6 was stronger during the initial stage of its popularization, and its resistance dropped significantly after 1979. Southern Japonica 15 in Jiangsu Province was originally a resistant variety. After introduced into Zhejiang Province, some strains were found to be susceptible. There are indications that the instability of variety resistance and its loss and strain of variation related. Proved province of rice bacterial leaf blight flora distribution and pathogen differentiation,