介壳虫是昆虫中奇特的一个类群,种类、虫态不易区分。雌、雄异形,雌虫无翅,头、胸、腹分界很不明显;雄虫有一对膜质的前翅,后翅特化为平衡棍;身体很小或微小;不活动或不活泼。通常是雌成虫,若虫群聚于枝、叶及果实上,用刺吸式口器插入花木枝叶组织内,大量吸取汁液,造成枝叶萎黄,乃至整枝、整株枯死。同时,介壳虫的介壳或所分泌 Scale insects is a peculiar insect group, species, insects is not easy to distinguish. Female, male and female, wingless females, head, chest, abdomen boundaries are not obvious; male has a pair of membranous forewing, rear wings specializes in balance sticks; body is small or small; inactive or inactive. Usually female adults, nymphs clustered in the branches, leaves and fruits, with piercing suction mouthparts into the branches and leaves of flowers and trees, a large number of draw juice, resulting in foliage chlorosis, and even pruning, the whole dead. At the same time, the scale shell or secretion of scale insects