梨木虱发生的代数多,成虫出蛰期长,世代重叠。特别是6月下旬至7月上旬,若虫分泌大量粘液,导致大量落叶,不仅严重影响树势,而且使梨果品质下降,用一般农药防治难以控制。用烟草石灰水防治效果可达95%以上。1.烟草石灰水的配制烟草1公斤、生石灰1公斤、水30公斤。先用10公斤开水 Pear lice occurrence of algebra and more adult out of sting, overlap generations. Especially from late June to early July, nymphs secrete a large amount of mucus, resulting in a large number of leaves, not only seriously affect the tree vigor, but also to reduce the quality of pear fruit, with the general control of pesticides is difficult to control. With lime control effect of tobacco up to 95%. 1. Preparation of tobacco lime water 1 kg of tobacco, lime 1 kg, water 30 kg. First with 10 kilograms of boiling water