越冬对腰带长体茧蜂及亚洲玉米螟的影响

Effect of wintering on Macrocentrus cingulumBrischke (Hymenoptera: Braconidae)and Ostrinia furnacalis(Guenée) (Lepidoptera: Pyralidae)

以寄生率、体重、化蛹率为指标 ,从协同进化的角度研究分析了越冬对腰带长体茧蜂MacrocentruscingulumBrischke及其寄主亚洲玉米螟Ostriniafurnacalis(Guen啨ｅ)的影响 .结果表明 :越冬使腰带长体茧蜂的寄生率大幅度下降 ;该蜂能够调节玉米螟的生长发育、促使玉米螟体重增加 .分析认为 :越冬淘汰了对玉米螟调节能力弱的腰带长体茧蜂个体和防御能力差的亚洲玉米螟个体 ,选择保留了适应性强的茧蜂和玉米螟个体 .越冬是腰带长体茧蜂与玉米螟协同进化的推动力量之一 .

The rate of parasitized, weight of mature larvae and pupation rate of Ostrinia furnacalis(Guenée) (Lepidoptera: Pyralidae) were observed to study the effect of wintering on Macrocentrus cingulum Brischke (Hymenoptera: Braconidae) and its host O.furnacalis.The results show: M.cingulum could promote the development of O.furnacalis and made its host heavier. There was a big range decline in the rate of parasitized O. furnacalis after winter. Under winter condition, the individuals of M. cingulum with stronger regulation capacity were selected and preserved, the individuals of O. furnacalis with stronger defense capacity were selected and preserved. The winter condition was regarded as one of the incentives for the coevolution between M.cingulum Brischke and O. furnacalis(Guenée).