按花势强弱,将稻穗上的颖花(包括病粒和健粒)分成7个等级,1级最强,7级最弱。统计水稻品种三粒寸的166个穗上365粒病粒在穗部的分布情况表明,稻粒黑粉病Neovossia horrida(Tak)的病粒主要分布在弱势花上.分别是:1级—0.27%,02级—0.55%,3级—8.77%,4级17.81%,5级20.27%,6级29.59%.7级28.22%.其中5—7级共占78.08%,其病粒的花位势平均为5.75级.如果以每个一次分枝为单位统计病粒在穗部的分布,品种三粒寸的病粒主要分布 According to the strength of the flowers, the spikes on the rice panicle (including the sick grain and healthy grain) are divided into seven levels, the strongest level 1, 7 the weakest. The distribution of 365 grains in 166 ears of rice with three grains in rice showed that the grains of Neovossia horrida (Tak) were mainly distributed in the weaker flowers, which were: Grade 1 -0.27 %, Grade 02 -0.55%, Grade 3 -8.77%, Grade 4 17.81%, Grade 5 20.27%, Grade 6 29.59%. Grade 7 28.22%, of which Grade 5-7 together accounted for 78.08% Potential average of 5.75 If you count each branch in the panicle in the distribution of the panicle, the three varieties of grain size of the main distribution