苎麻根腐线虫病是导致苎麻败蔸,造成单产不高的主要原因。据主产麻区湖南、湖北、四川、江西、广西、贵州等省区,万余亩三龄以上老麻地调查,平均发病率56.5％,病情指数~*32.31,其中长江流域麻区发病最重。从健、病麻地测产和经药剂防治后的增产效果看,发病中等的麻地,产量损失20— Ramie nematode is the main cause of ramie failure, resulting in low yields. According to the survey, the average incidence rate was 56.5% and the disease index was * 32.31, of which more than 10,000 mu were found in the third and fourth instar of the old mahjong region, among which the main producing area was Hunan, Hubei, Sichuan, Jiangxi, Guangxi and Guizhou provinces, . From Jian, Ma Ma Ma test and after the drug control effect of increasing yield, the incidence of moderate Ma, yield loss of 20-