稻粒黑粉病多在江苏等地的杂交稻制种田发生。由于杂交稻制种产量较低,受稻粒黑粉病危害后产量损失大,会影响经济效益。稻粒黑粉病病菌以厚垣孢子侵入植株,水稻孕穗期和抽穗扬花期均能侵入,开始灌浆时不能侵入。因此,防治稻粒黑粉病应在破口至抽穗扬花 Rice powdery mildew and more in Jiangsu and other places hybrid rice farming occurs. Due to the low yield of hybrid rice seed production, powdery mildew caused by rice grain yield loss after large, will affect the economic benefits. Pathogen of rice powdery mildew Invaded plants by chlamydospores, rice booting and flowering period can invade, the beginning of grouting can not invade. Therefore, the prevention and control of rice powdery mildew should be broken to the earring flowering