黔阳县白背飞虱种群发展与生态关系的研究

STUDIES ON THE RELATIONS BETWEEN THE POPULATION FLUCTUATION OF Sogatella furcifera AND THEIR ECOLOGICAL FACTORS

分析了黔阳县１９８０年以来不同类型水稻白背飞虱虫源性质及与本田发生危害的关系．迁入量大和迁入峰次多是当代大发生的关键因素．早、晚稻本田各出现３次若虫盛发高峰．中稻区稻田随海拔升高，飞虱若虫峰次减少；海拔９００ｍ以上稻田一般只出现１次若虫高峰．雌成虫密度低，则繁殖率高，反之则低．不同水稻品种对飞虱抗性差异明显．

Since 1980 the relations between the characters of the source of Sogatellafurifera on different types of rice and the damaging occurrence rice fields in Qianyang coun-ty have been analysed.The key factors of outbreak from present generation were that thenumber of immigration was numerous,and the peaks of immigration was frequent.The oc-currence peaks of nymph were three times in early rice fields or in late rice fields,respective-ly the peaks of nymph decreased as the rice fields followed the elevation rise in the region ofmiddle rice。If the rice fields locate in elevation over 900 metre,the peak of nymph only oc-cur once. If the density of female adult planthopper is lower, its reproduction rate will behigher,conversely,it will be lower.The difference on resistances of varieties of rice to theseplanthopper were obvious.