烟蚜茧蜂Aphidius gifuensis Ashmead生物学研究——Ⅰ.发育过程和幼期形态

Bionomics of Aphidius gifuensis Ashmead 1.development stages and morphology of Larval stage

烟蚜茧蜂是寄生于桃蚜等蚜虫的一种重要寄生蜂。幼虫期4龄。在19℃恒温,14h 光照,10h 黑暗,相对湿度70%～90%的条件下,烟蚜茧蜂的发育历期为卵期2～3d,幼虫期6～7d(其中Ⅰ龄幼虫48～60h,Ⅱ、Ⅲ、Ⅳ龄幼虫为24～36h)预蛹期和蛹期3～4d。对烟蚜茧蜂由卵发育到成蜂的各期形态、量度大小和发育情况进行了详细的描述。对这一昆虫在不同的恒温和变温组合下的发育历期进行了测定。试验证明无论恒温和变温,烟蚜茧蜂的发育历期均随温度升高而缩短。发育完成的僵蚜于2～3℃冰箱中保存180d 后仍有30%可正常羽化。

The present paper reports the result on studies of developmentstages and morphology of Aphidius gifucnsis Ashmead,a parasite of greenpeach aphid Myzus p(?)rsica(?) Sulzer.The A.gifuensis has four larval instars.The morphology and size of this aphidiid from egg to adult were describedand measured.The development period of different stages of this insectwere determined under various constant and alternating regimes.Under thelaboratory condition of constant temperature 19℃,photoperiod 14 hr perday,relative humidity 70%～90%,the development periods of egg stage,larval stage and pupal stage(and prepupal stage)were 2～3,6～7,3～4 days respectively.The development period of 1,2,3,4 instar larvaewere 48～60,24～36,24～36,24～36 hours respectively.Time from egg toadult emergence decreased with any increase in temperature either constantor alternating.Thirty per cent of the adults could emerge from mummiedaphids after 180 days storage in 2～3℃ refrigerator.