一、发生规律1.危害症状主要以若虫、成虫刺吸芽、叶及嫩梢危害,严重时全叶变褐引起早期落叶。新梢被害后发育不良。若虫分泌大量黏液,诱发煤污病。果实受害后果面呈片状黑点,多分布于果实上半部。2.生活规律梨木虱在库尔勒地区1年发生4～5代,以冬型成虫在枝干的树皮裂缝内、杂草、落叶及土缝中越冬。梨花花芽萌动期开始出蛰活动,3月中下旬成虫 First, the occurrence of law 1. Harm the main symptoms of nymphs, adult bud sprouts, leaves and tender tip hazards, severe browning caused by the whole leaves early deciduous. Shoot damage after the development of new shoots. Nymph secretion of a large number of mucus, induced coal pollution. The fruits of the fruit were flaky black spots, mostly in the upper half of the fruit. 2. The law of life Pear lice in the Korla region 1 to 4 years to 5 generations, with winter-type adults in the stem bark cracks, weeds, deciduous and soil cracks in winter. Pear flower bud germination start sting activities, adults in mid-March