梨木虱是我国北方梨区的主要害虫。近年在卫辉的发生逐年加重 ,主要危害梨树叶片。常以若虫群居于叶片刺吸汁液 ,使受害叶片沿主脉向背面弯曲成半月形 ,严重时皱缩成团 ,虫体分泌黏液 ,并引起煤污病 ,污染叶面和果面 ,导致果实发育不良 ,品质下降。据初步调查 ,梨树被害株率８ Pear lice is the main pest in northern pear region of our country. In recent years, the occurrence of Wei Hui increased year by year, the main hazards pear leaves. Often nymphs in the leaf sucking juice, the victim leaves bent along the back of the main curve into a semilunar, severe shrinkage into groups, parasites secrete mucus, and cause coal pollution, pollution of the foliage and fruit, resulting in fruit Dysplasia, quality decline. According to a preliminary investigation, the pear victimization rate of 8