1982～1984年对寄生稻飞虱的多索线虫在浙江省宁波地区的分布进行了调查。结果表明:平原、丘陵、沿海以至海拔800米山区稻田都有多索线虫的存在。其宿主有褐稻虱等6种,寄生率28.6～88.9％,是稻飞虱的重要寄生性天敌。多索线虫的适宜生境为:一般稻田有机质含量3％以上,pH 5.5～6.5,质地中粘土或轻粘土,田间湿度较高。 From 1982 to 1984, the distribution of the parasitoid planthoppers, Dorset isolates, in Ningbo, Zhejiang Province, was investigated. The results showed that all the plains, hills, coastal areas and rice fields at an altitude of 800 meters have the presence of Dodozoans. Its host has 6 species of brown planthopper, parasitic rate of 28.6 ~ 88.9%, is an important parasitic natural enemy of planthoppers. The suitable habitat of Dodo nematodes are as follows: Generally, the content of organic matter in rice field is more than 3%, the pH is 5.5-6.5, the clay is medium texture or light clay, the humidity in the field is higher.