梨木虱以若虫、成虫吸食芽、叶、新梢汁液,并分泌粘液,大量粘液在雨季常常诱致煤烟病,严重时会造成早期落叶,果面污染,果品失去商品价值。梨木虱在我省每年发生5—6代,以成虫在树皮、裂缝、杂草、落叶中越冬。第二年2月下旬开始出蛰活动,3月上旬为出蛰盛期。成虫出蛰后交尾,在果台上产卵,卵期一般七天左右,花现蕾时卵开始孵化第一代若虫,花后为孵化盛期。孵化的若虫在叶腋处为害,4月下旬开始羽化成虫,并在果台、新梢、叶片上产卵,6月初开始出现第二代若虫。这一代 Pests nymphs, adults suck buds, leaves, shoots and juice, and secretion of mucus, a large number of mucus in the rainy season often lead to sooty disease, will result in early leaves, fruit surface contamination, loss of commodity value of fruit. Pear lice occur in our province 5-6 generations per year, in order to adults in the bark, cracks, weeds, deciduous wintering. The second year in late February began sting activities, early in March as a sting Sheng period. Adults sting out after mating, oviposit on the fruit sets, the egg period is generally about seven days, when the flower buds eggs began to hatch the first generation of nymphs, after flowering incubation period. The hatching nymphs are damaged in the leaf axils and begin to emerge in late April and grow on the fruit trees, shoots and leaves, and the second generation nymphs begin to appear in early June. This generation