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梨木虱（PsyllapyrisugaFoerster）属同翅目，木虱科，是梨树上主要害虫之一。北方各地区分布曾连，山东发生也较多，常出现局部严重为害的现象。成虫、若虫，待别是二三代若虫为害最重，若央在寄主嫩梢、嫩叶背面及成叶正面尖端为害，能分泌富在，并利用蜜场粘贴相邻叶片隐藏
Psylla pyrisugaFoerster belongs to Homoptera, Picea, which is one of the major pests on pear tree. Zenglian has been distributed in various regions in the north and there are many cases in Shandong Province, with some cases of grave and serious damage occurring. Adults, nymphs, to be the second and third generation nymphs to be the most damaging victims, if the central young shoots in the host, young leaves on the back and into the front of the leaf tip damage, can be rich in secretion, and use the honey field paste adjacent leaves hidden