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稻瘟病是国内外水稻上的一个重要病害。我省五十年代除叙永县的水尾区等个别地区常发外,一般发生较轻,在生产上不是一个问题。六十年代以后,随着耕作制度的改革,品种的调换,密植和施肥水平的提高,稻瘟病的危害逐年加重。其发生危害特点,大体是:川西北地区以中稻受害最重,早、晚稻受害较轻;川东南地区以晚稻受害最重,中稻
Rice blast is an important disease on rice at home and abroad. In the fifties of our province, except for the frequent occurrences in some areas such as the water tail area of Xuyong County, the general occurrence is light, which is not a problem in production. Since the 1960s, with the reform of farming system, the exchange of varieties, the close planting and the improvement of fertilization levels, the harm of rice blast has been increasing year by year. The characteristics of its occurrence are as follows: In the northwest of Sichuan Province, the middle-aged rice is hardest hit and the early and late rice suffer less; the late-season rice is hardest hit in southeastern Sichuan,