库尔勒香梨绵粉蚧生物学特性及危害

The Biological Characteristics and Damage of Phenacoccus mespili (Geoffroy) in Korla Pears

在库尔勒地区,选择具有代表性的梨树,定点定株观察梨绵粉蚧在库尔勒香梨上的生活史和生活习性。结果表明:该虫一年发生3代,以若虫在树皮裂缝、翘皮下越冬。第1代生长发育整齐,卵高峰出现在5月中旬,1龄若虫活动高峰在6月上旬;2、3代出现世代重叠现象,第3代卵孵化盛期在9月中、下旬。成虫产卵时有卵囊,卵块15～315粒/块,初孵若虫善于爬行;以若、成虫吸取皮层汁液影响树势,附着于果实萼洼处为害,并形成贮藏害虫,降低商品果率。

The representative pear trees were selected to observe the life history and the biological property of the Phe- nacoccus mespili （Geoffroy） in Korla area. The results showed that there were 3 generations per year in Korla pears,the nymph overwintered under the raise bark,or within crevice-bark. The first generation grow and developd evenly,and the egg＇s peak appeared during mid-July,the activity peak of the 1st instar nymph was at later of June;the second and third generations had the overlapped generations, the egg incubation peak of the third generation were in middle late Septem- ber. There were oocysts when the adults began to lay eggs,and there were 15~315 eggs of one egg mass. The newly- hatched nymph was adept in crawl ; Sucking the juice of the branches and trunk by the nymph and adult cause the growth weak of the tree,which usually attached themselves to calyx hollow,and the rate of the commodity fruit was reduced.