槐树长珠蚧的生物学特性

Bionomics of Neogreenia sophorica

槐树长珠蚧Neogreenia sophorica Wu是2004年发现于北京东城区的一种新害虫,危害槐树。在北京1年发生1代,有3个龄期,以2龄若虫过冬。营孤雌生殖。每头雌蚧平均产卵105粒,平均孵化率47.53%。1龄若虫期有扩散能力,固定后分布在树干基部1m以上,直径大于5cm的枝条的树皮下。防治的最佳时机应在1龄若虫涌散期。

Neogreenia sophorica Wu is a new pest of Sophora japonica L. found in Dongcheng District of Beijing city in 2004. It has one generation per year, and over-winteres as 2nd instar nymphs （cysts） under bark on stem and branches. One adult female laid 105 eggs on average parthenogenesisly. The hatchabihty of egg is 47.53% o After settled the first instar nymphse always parasite inside phloem of the trunk above 1 m from the horizon and branches that are more than 5 cm in the diameter. Finally, chemical control in dispersion periods nymphs of first instar is suggested.