1发病规律及症状稻粒黑粉病是一种由真菌侵染引起的病害,病菌的厚垣孢子在土壤种子上越冬,种子带病菌是侵染源之一,但以土壤表面菌源为主。当第2年水稻开花期,病菌萌发产生小孢子并随水、随风飘散,侵入水稻花器,病菌菌丝在谷粒颖花内蔓延,使米粒不成形,种子成熟后,部分病粒颖花随雨开裂,病菌粘到附近健粒上或落入土壤 1 pathogenesis and symptoms Rice powdery mildew is a disease caused by fungal infection, bacteria chlamydospore overwinter in soil seeds, seed germs are one of the sources of infection, but the main surface soil sources . When the second year of flowering in rice, the germination of bacteria produce microspores and with the water, wind drift, invaded rice flower, bacteria mycelium spread in the grain spikelets, so that the rice is not formed, the seeds mature, part of the particles spike Cracks with rain, the bacteria stick to the nearby particles or fall into the soil