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(一)品种间发病差异和产量.调查参加本所后季稻区试的各品种,在施肥和管理水平相同的情况下,发病最重的是6516,病穗率为85.5%,秕谷率33.7%,亩产621.5斤;发病最轻的是盐粳902-2,病穗率为10.0%,秕谷率为15.3%,亩产783.5斤.多数品种发病率在22.5～56.0%(表1).(二)不同稻曲粒数对产量的影响.据测定,单穗千粒重和产量随着病粒的增加而下降,而秕谷率
(A) the incidence of differences between the varieties and yield survey of the varieties of the region after the test quarter of rice varieties, fertilizers and management at the same level of cases, the incidence of the most severe is 6516, disease panicle rate of 85.5% 33.7% and 621.5 kg per mu respectively. The lightest incidence was salt japonica 902-2, the rate of diseased spike was 10.0%, the rate of stomatal formation was 15.3% and the yield was 783.5 kg per mu. The incidence of most cultivars ranged from 22.5% to 56.0% (B) the impact of different rice grain number on the yield.According to the determination, 1000 grain weight per panicle and yield decreased with the increase of grain,