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1 杂交稻制种稻粒黑粉病发生原因1.1 抽穗扬花期气候条件宿松县近4a 来杂交稻制种稻粒黑粉病的发病率与气温及降水量的关系表明(见表1),黑粉病的发生轻重程度年度间差异较大,一年中不同抽穗扬花时段轻重程度也不一样。即不育系抽穗扬花时期日平均气温在26℃以上,雨日天数少,降水量小,发病就轻;日平均气温23℃以下,雨日天
1 hybrid rice seedlings of rice black powder disease causes 1.1 heading and flowering climatic conditions Susong County near 4a to hybrid rice seedling incidence of powdery mildew and the relationship between temperature and precipitation shows (see Table 1) The severity of the incidence of smut varies significantly from year to year, and the duration of different heading and flowering periods in different years is also different. That is, the average daily temperature of the male sterile line at the heading and flowering stage is above 26 ℃, the number of rainy days is small, the precipitation is small and the incidence is light; the average daily temperature is below 23 ℃,