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近年来,稻粒黑粉病已成为杂交水稻繁殖制种中的主要病害。据调查,不育系穗发病率高达80%,粒发病率达10～15%,高的达40%以上,严重影响了杂交水稻种子产量和质量的提高。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和种子上越冬。稻粒黑粉病有其特殊的侵染特点和发病规律。如侵染的部位较为专一,时间较短,侵染机会受父本花粉量的影响较大,菌源量受湿度限制较大等。因此,采取及时有效的综合措施,降低田间湿度,减少病源,控制病菌的初侵染,是繁殖制种田防治病害发生的中心内
In recent years, rice powdery mildew has become the main disease in hybrid rice seed production. According to the survey, the incidence of male spikes is as high as 80%, the incidence of grains is 10-15% and the height is over 40%, which seriously affects the yield and quality of hybrid rice seeds. Rice powdery mildew is a disease caused by fungal infection, chlamydospores of bacteria overwinter in soil and seeds. Rice powdery mildew has its special characteristics and incidence of infection. If the site of infection is more specific, the time is shorter, the impact of infection is more affected by the pollen amount of the father, the source of bacteria by humidity and other restrictions. Therefore, to take timely and effective integrated measures to reduce the field humidity, reduce the source of disease, control of the initial infection of germs, is the breeding center of disease prevention and control of farming