梨木虱是梨树的主要害虫之一，绝大多数果农都反映喷药不见效果，久治难防。究其原因，首先是梨木虱成虫活泼，善于跳跃，来去不定，活动范围广；其次是梨木虱若虫为害期常分泌粘液和蜡质絮状物，农药难以渗透和触杀；加之密植梨园生长期枝繁叶茂，梨木虱个体微小，世代重... Pear lice is one of the major pests of pears, the vast majority of fruit farmers have shown no effect of spraying, long treatment difficult to prevent. The reason, first of all pear psylla lively, good at jumping, uncertain, wide range of activities; followed by pear lice nymphs often secrete mucus and waxy flocs, pesticides difficult to infiltrate and touch; coupled with dense pear orchard growth period Lush, pear psylla individual small, generations ...