梨网位除为害梨外，还为害苹果、海棠、山植、樱桃、桃、杏、李等果树，以成虫、若虫在叶背主脉两侧刺吸为害，被害处常积集斑点状的稿黑色粪便及脱皮壳，成虫产卵时也留下蝇粪状黑点，使整个叶背面呈现锈黄色，叶正面形成苍白斑点，严重时全叶苍白，以后于枯脱落．在北方果区? Pear net addition to pear, but also damage apple, Begonia, mountain plants, cherry, peach, apricot, plum and other fruit trees, adults, nymphs on both sides of leaf dorsal suction thorns harmful damage often plot set-like Manuscript black feces and peeling shell, adult eggs also leave fly feces black spots, so that the whole leaf back rusty yellow, the formation of pale leaves positive spots, the whole leaf pale severe, after the fall off. In the northern fruit area?