烟蚜茧蜂Aphidins　gifuensis　Ashmead生物学研究Ⅱ．成虫生物学及越冬

Bionomics of Aphidius gifuensis Ashmead Ⅱ. Bionomics of Adult and Over Winter

烟蚜茧蜂在有雌雄两性存在的情况下，营两性生殖。未交配过的雌虫只生殖雄性后代。雌雄配对均可在２４ｈ内完成交配，交配过的雄蜂可再次支配，而雌蜂无此情况。雌蜂对蚜虫是否已被寄生并无分辨力，导致过寄生现象出现。过寄生程度随寄生的密度增大而减轻，反之则加重。雌蜂产卵对Ⅲ龄若蚜有明显的选择性。雌蜂１次仅产１粒卵，卵的孵化率高达９８％．成蜂寿命随温度升高而逐渐缩短，但饲喂以清水、蚜虫蜜露、１０％蜂蜜水均可使成蜂寿命延长。成蜂性比亦随温度和季节的不同而变异。兼性滞育。田间调查已发现其重寄生蜂７种。

Some aspects of biology of Aphidius gifuensis Ashmead were studied in the laboratory. The mated female of this aphidiid produced progeny of both sexes,unmated female produced male progeny only. Both males and females mated within 24 hours after emergence. Males were capable of mating more than once (n=10), for females this behaviour was not found. The females laid their eggs in aphid without distingishing its host parasitized or not, resulted in aphid superparasitized. The extent of superparasitization decreased with an increase in the number host aphids provided. This aphidiid was apparently favour of parasitizing the third nymph instar when seven instars and morphs of the aphid expose to oviposition. Only one egg was laid per insertion of the ovipositor. The percentage of egg hatched was more than 98%. The mean lifespan of adult decreased gradully as the temperature rised,supplying with water. Honeydew and 10%; honey-water helped the adult live longer. Sexratio of adult varied with temperature and season. Facultative diapause occured. Seven hyperparasitoids species parasitoids species parasitized this aphidiid were reported.