浙江上虞黑胸大蠊卵荚寄生蜂的初步研究

Preliminary Studies on Oothecal Parasites of Cockroach (Periplaneta fuliginosa) in Shangyu County, Zhejiang Province.

在浙江省上虞县黑胸大蠊卵荚中发现了Tetrastichodes sp.,Tetrastichus hage-nowii(Ratz.)和Evania sp.三种寄生蜂。T.sp.分布广,占寄生蜂总数的86.2%。T.sp.和T.h.混合自然寄生率64.2%,可在同一生境混合存在,在暴露和隐蔽场所的卵荚中均可寄生,但寄生率前者高于后者。按本县气溫,T.sp.估计全年可繁殖3～5代。对T.sp.和T.h.每个卵荚羽化的成蜂数量、性比例、体长、寿命、交尾和产卵等习性都作了观察或测量。结果表明,T.sp.和T.h.两种寄生蜂用于生物防制本地的黑胸大蠊很有希望。

Three oothecal parasites of cockroach, Periplaneta fuliginosa, (Serv.)are discovered in Shangyu County, Zhejiang Province. They are Tetrastichodes sp., Tetrastichus hagenowii (Ratz.) and Evania sp.. T. sp. is widely distributed in Shangyu. It occupies 86.2 per cent The mixed parasitism rate of T. sp. and T. hagenowii in nature is 64.2 per cent (oothecae being 51.8% and oothecal shell 68.4%). Both are presented in the same biotope. The oothecae may be parasitized in exposed and hidden sites, but the parasitism rate of the former is higher than that of the latter. T, sp. is estimated to breed 3～5 generations in a year according to the local climate. Such items as the average number of adults emerging from a single ootheca of T. sp. and T. hagenowii, the sexual ratio, the body length, the life span, the mating and the oviposition have been observed and measured. The resalts fully showed that from the biological point of view these two species are of great potential value to controlling local Periplaneta fuliginosa.