梨木虱Psylla pyrisuga Forst是梨树的主要害虫之一。近几年为害日趋严重,有些地区因此造成早期落叶,使树势衰弱,影响果实的产量和质量。梨木虱在河北省分布很普遍,据调查在昌黎、束鹿、南皮、交河、定县、曲阳、宁晋、河间及兴隆等地都有为害,以昌黎和束 Psylla pyrisuga Forst is one of the major pests of pear trees. In recent years, the damage has become more and more serious. In some areas, early deciduous leaves are thus formed, which weakens the shrubs and affects the yield and quality of the fruits. Pear lice distribution in Hebei Province is very common, according to the survey in Changli, Shulu, Nanpi, Jiaohe, Dingxian, Quyang, Ningjin, Hejian and Xinglong have damage to Changli and beam