苎麻疫霉病是苎麻生产上的主要病害之一,全国各地麻区均有发生,常造成叶片腐烂,引起落叶早衰。据调查,我区的一些重点麻区头麻病叶指数为16.53～27.02％;二麻为6.89～14.08％;三麻为4.24～11.15％。按头麻减产损失计算:发病达二级(共分四级)的,干麻减收为28.30％,纤维支数下降4.60％;发病达三级的,干麻减收为37.73％,纤维支数下降12.78％。可见此病对产量和品质影响很大。关于苎麻霉疫的研究,仅1977年江苏农学院在病原形态上作过简单的记述,国内有关本病其它方面的研究很少报道。我所从1981—1983年开始对此病的发生及防治措施 Phytophthora ramets ramie is one of the major diseases in the production of marijuana throughout the country have occurred, often resulting in leaf decay, causing decay and premature aging. According to the survey, some of the key areas in our area are 16.53-27.02% of first-degree diseased leaf area index, 6.89-14.08% of the second flax and 4.24-11.15% of the third flax. According to the loss of head and hemp loss: incidence of up to two (divided into four levels), dry hemp reduced to 28.30%, the number of fibers decreased 4.60%; up to three levels, dry and hemp reduced to 37.73%, fiber branch The number dropped 12.78%. Shows that the disease on the yield and quality of great influence. On ramie mold research, only in 1977, Jiangsu Agricultural College made a simple description of the pathogen morphology, the rest of the domestic research on this disease is rarely reported. I started from 1981 to 1983 the occurrence of the disease and prevention and treatment