烟草石灰水防治梨木虱效果好梨木虱是梨树的主要害虫，在我省每年发生５～６代，以若虫吸食叶片汁液，并危害果实和嫩芽。受害严重的果园，叶片早期脱落，果面污染，树势衰弱，严重影响果品的产量和质量。１９９４～１９９６年我们在河间市和献县几个梨园试用烟草石灰水防... Tobacco limewater prevention and control of pear psylla good pear psylla is the main pests of pears, occurs in our province from 5 to 6 generations a year, to nymphal use of leaf juice, and endanger fruit and shoots. Seriously damaged orchards, early leaves off, fruit pollution, weak trees, seriously affecting the yield and quality of fruit. From 1994 to 1996, we experimented with tobacco lime water in several pear orchards in Hejian and Xianxian.