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稻瘟病始终是世界上传播最广的水稻真菌病害。最近,发现其危害性在加强,其危害与水稻生产的集约化有关,同施用高氮有关,同秧苗的机械化移植有关,甚至同广泛的推广现代化高产品种有关。高产品种高度集中引起了作物遗传的一致性,并促使有毒力的小种病原体群体的积累。世界上水稻稻瘟病,从60年代末开始流行,就是对这种现象的证实。由于稻瘟病传播引起稻谷的巨大损失,在中美,拉丁美洲的墨西哥,秘鲁、尼加拉
Rice blast has always been the most widely spread rice fungal disease in the world. Recently, it has been found that its harmfulness is strengthening. Its harmfulness is related to the intensification of rice production, to the use of high nitrogen, to mechanized transplanting of seedlings, and even to widespread promotion of modern high-yielding varieties. The high concentration of high-yielding species has led to crop genetic homogeneity and contributed to the accumulation of virulent germ-borne pathogens. The world’s rice blast, which became popular from the late 1960s, is a confirmation of this phenomenon. Due to the huge losses caused by the spread of rice blast in China, the United States, Latin America, Mexico, Peru, Nicaragua