浙江蜚蠊卵荚寄生蜂的调查研究

对浙江８个代表性地区的调查结果：①共发现蜚蠊卵荚寄生蜂３种，其中Ｔ．ｓｐ．和Ｅ．ａ．广泛分布，Ｔ．ｈ．仅在少数地区个别点上发现：②黑胸大蠊卵荚被Ｔ．ｓｐ，寄生的占９７．６％，被Ｔ．ｈ．寄生的占２．３％，被Ｅ．ａ．寄生的偶见；美洲大蠊卵荚被Ｅ．ａ．寄生的占８１．０％，被Ｔ．ｓｐ．寄生的占１９．０％；③Ｔ．ｓｐ．在活卵荚中的寄生率最高（７３．２％），死卵荚中最低（２６．２％）．卵荚壳居中（６７．６％），合计寄生率５８．４％；据现场调查，卵荚壳占６９．０％，死卵荚占２３．３％，活卵荚占７．７％，表明在卵英壳的寄生率最能反映一个地区寄生蜂寄生的实际情况；④厨房菜桌下、菜柜内外、抽屉内等是蜚蠊卵荚分布最多的场所，是防制重点；Ｔ．ｓｐ．在隐蔽场所对蜚蠊卵荚的寄生率低于暴露场所。此点在生物防制时应加以注意。

Studies on the Oothecal Parasites of Cockroaches in Zhejiang Province

This report dealed with studies on oothecal parasites of cockroaches in 8 select districts in Zhejiang province.The main points were as follows:1.Three species of wasps were discovered Among them,T.sp.and E.a. were widely distributed over many areas.T.h.were found only at some particular spots in a few districts.2.According to the findings, 97.6%of the oothecae of cockroaches Periplaneta fuliginosa were parasitized by T.sp;2.3%of them by T.h.and those parasitized by E.a. were only occasionally found.As for the oothecae of cockroaches Periplaneta americana, 81%of them were parasitized by E.a. and 19%by T.sp.3.The parasitic rate of T.sp. was the highest in living oothecae (73.2%); iit was the lowest in dead oothecae (26.2%); in oothecal shells it was medium(67.6%). The total rate in the three cases reached 58.4%.Our field collection showed that oothecal shells, dead oothecae and living oothecae held 69%, 23.3%and 7.7%respectively.The parasitic rate of ootbecal shells usually explains the real condition of wasp parasitism in a certain place.4.Oothecae were mainly found under a kitchen table, inside and outside a cupboard, and in drawers.Therefore, these were the important places for ootheca-controlling.The parasitic rate of T.sp. oothecae was lower in hidden places than in exposed places.This should be paid much attention to in biological controlling.