鄂北地区栗瘿蜂综合防治技术研究

A Study on the Integrated Control Technique of Dryocosmus kuriphilus Yasumatsu in North Hubei.

栗瘿蜂在鄂北地区一年发生一代，以初龄幼虫在被害芽内越冬。翌年４月上旬栗芽萌动时开始为害，使被害芽形成虫瘿抑制新梢生长，导致减产甚至绝收。当地该瘿蜂优势种天敌是中华长尾小蜂，益害比１∶５时能抑制栗瘿蜂的大发生。以冬季清园铲除杂草，剪除病虫枝等农业防治为基础，收集虫瘿于３月下旬挂于栗园保护天敌为主导，辅之以化学防治的综合防治措施能有效地控制栗瘿蜂的为害。

In north Hubei,the chestnut gall-wasp,Dryocosmus kuriphilus Yasumatsu reproduces oncea year.Their larvae overwinter in the chestnut buds,and begin to move when the buds grow in early Aprilof the next year.The resulting galls restrain the growth of new shoots,and therefore,affect the gains ofnuts,or even worse.The Chalcids,Torymus syntomaspis,is a dominant natural enemy against the gall-wasp in this area.The outbreak of this gall-wasp can be controlled when the ratio of the parasitoids to thepests is one to five.On the basis of clearing up the orchard by eliminating other bushes and cutting up theintruded twigs,to develop the natural enemy by collecting the galls and hanging them in the orchard inlate March is effective. Pesticides can also be applied as an accessory measure to reduce the damage.