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1980年7月上旬,从一批生长不良的稻株标样中,发现两株心叶颜色较淡,稍见矮缩症状的秧苗,初步鉴定为水稻霜霉病。通过对5个县、市、13个公社的调查结果,73块病因,平均发病率为22.35％,严重的达30—50％,甚至颗粒无收。全区发病面积约在5万亩以上,发病范围广,面积大,在局部地区已造成严重危害,该病已成为水稻生产上的新问题。现将调查研究结果初报如下。一、症状记述据调查与系统观察,水稻霜霉病的苗期症状不太明显,7月上、中旬,当水稻进入分
In early July 1980, from a group of poorly-grown rice plant samples, it was found that two leaflets with lighter color and little dwarfing symptoms were initially identified as rice downy mildew. Through the survey results of 13 communes in 5 counties, cities and 73 communes, the average incidence rate was 22.35% and the severity was 30-50%. The disease area of about 50000 acres in the region, the incidence of a wide range, large area, in some areas have caused serious harm, the disease has become a new problem in rice production. Now the investigation results are as follows. First, the symptoms described According to the survey and systematic observation, the symptoms of rice downy mildew is not obvious, in July on the middle, when rice into the points