梨圆蚧Quaraspiliotus perniciosus (Comst.)以为害果树为主,近年来发现严重为害杨树,在丹东地区主要为害家榆,被害株率75.8%。1年发生2代,以1龄固定若虫越冬,越冬代雌成虫5月中旬、第1代雌成虫7月中旬开始羽化,初产卵胚胎发育已经完成。梨圆蚧有3种捕食性、5种寄生性天敌。其中,黑背唇瓢虫4龄幼虫日均捕食蚧雌成虫81.3头;小蜂、蚜小蜂、四节蚜小蜂平均混合寄生率为35.5%。 Quaraspiliotus perniciosus (Comst.) Is the dominant fruit tree. In recent years, it has been found that poplar is severely harmed and Ulmus spp. The first generation of female nymphs began to emerge in mid-July and the first-generation female embryos had completed. Pear Kuwana has 3 kinds of predatory, 5 kinds of parasitic natural enemies. Among them, the fourth instar larvae of Black-dipped Ladybug caught the average of 81.3 adult insects, while the average mixed parasitism rate of the small-bee, aphid wasp and four-stage aphid was 35.5%.