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梨木虱是危害梨树芽、叶、嫩梢、吸食树体汁液的一种不完全变态害虫,以若虫、成虫危害树体,成虫体长4～5毫米,夏季初羽化成虫呈淡黄色,到冬季变成暗褐色;若虫初
Pear louse is a pest that endangers pear tree buds, leaves, tender shoots and tree snails. In nymphs and adult pests, the adults are 4-5 mm in body length. Winter becomes dark brown; nymphs early