松突圆蚧花角蚜小蜂的生物学

松突圆蚧花角蚜小蜂Cocvobius azumai Tachikawa是松突圆蚧Hemiberlesla pitysophila Takagi的重要寄生蜂，1987-1989年从日本引入我国广东省。对松突圆蚧花角蚜小蜂的形态、发育、繁殖、成虫寿命和取食寄主行为等生物学特征进行了观察。该蜂的雌性幼虫是松突圆蚧雌蚧的初级内寄生蜂，而雄性幼虫则是次级寄生蜂，重寄生在同种或它种膜翅目的老熟幼虫、预蛹和蛹上。雌雄两性的形态在所有发育阶段均不相同。交配过的雄蜂喜欢寄生产卵初期和盛期的雌成蚧，对巳寄生的寄主具有识别能力。在19.7℃一30.9℃变温条件下每头雌蜂平均产卵14.95粒，约60%的卵是在最初3天内产出。松突圆蚧花角蚜小蜂雌性蜂在21℃，24℃，27℃和30℃时从卵发育到成虫的平均历期分别为41.24，32.60，25.60和23.00天，发育起点温度10.1℃，有效积温448.3日度。该蜂在广东省一年发生。9-10代。

BIOLOGY OF COCCOBIUS AZUMAI TACHIKAWA (HYMENOPTERA:APHELINIDAE)

Coccobius azumai Tachikawa is an important parasite of Hemiberlesia pitysophila Takagi (Homoptera:Diaspididae) and it has been purposely introduced into Guangdong Province in 1987-1989. Its morphology, development, reproduction, longevity and host-feeding behaviour were studied. Female larvae of C. azumaidevelop as primary endoparasitoid of H. Pitysophila females, whereas male larvae are secondary parasites, and develop on the mature larvae, prepupae and pupae of their own kind and other hymenopterous species. Sexual dimorphism occurs at all stages, including the deposited eggs. Mated females of C. azumai preferred to oviposit in gravid and egg-laying H. pitysophila females and could discriminate between parasitized and unparasitized hosts. A mated female laid about 14.75 eggs through 19.7-30.9C; 60% of the eggs were laid within the initial 3 days. Coccobius azumaifemales developed at 21℃, 24℃, 27℃ and 30℃ from egg to adult in 41.24, 32.60,25.60 and 23.00 days respectively. The thermal threshold and thermal sum for the development were 10.1℃ and 448.3 day-degrees respectively. The parasitoid had 9-10 generations a year in Guangdong Province.