长距茧蜂的生物学特性研究及放蜂试验

本文描述了长距茧蜂的形态特征，并研究了它的生物学特性，该蜂在重庆地区一年发生７—８代，以老熟幼虫在树隙、落叶、草丛中结茧越冬，可行孤雌生殖，成虫雌性多于雄性，该蜂寄生于桑螟幼龄幼虫、幼虫老熟时被寄生致死，平均寄生率达３６％，为寄生于桑螟幼虫体内的优势天敌，该蜂对桑螟的寄生在时间上具有明显的跟随现象，桑园内人工繁蜂放蜂可提高其寄生率。

BIOLOGICAL CHARACTERISICS OF MACROCENTRUS SP. AND EXPERIMENT WITH SETTING THEM FREE

It has been known that Macrocentrus sp.occurs 7-8 generations a year inChongqing area through the research on their morphological biological characteristics.They overwinter as mature larvae cocooning among rifts of trees and the fallen leaves aswell as in patches of grass.They can reproduce in parthenogenetic way.Females aremore than males among adults,The bees parasitize within the young larva of Diaphaniapyloalis( Walker ).The host die while the parasites grow u.Average parasitical ratereaches 36%and the bees are the superior natural enemy parasitized in larva of Diapha-nia pyloalis.The parasite of Macrocentrus sp.to Diaphania pyloalis has an obvious man-ner of timely following.In mulberry field artificial propagation of the bees and settingthem free can raise the parasitical rate