摘要： 以麦长管蚜为寄主，研究了不同寄主密度下烟蚜茧蜂的产卵量、寄生蚜量，并组建了不同寄主密度下的烟蚜茧蜂的生殖力表。结果表明：在寄主密度低于40头蚜/天/雌蜂，烟蚜茧蜂的产卵量随寄主密度的增加而增加，蚜虫的供应限制了该蜂的产卵量；寄主密度高于40头蚜/天/雌蜂时，烟蚜茧蜂的产卵量为493.3～587.5粒。烟蚜茧蜂的寄生蚜量亦随寄主密度的增加而增加，在寄主密度100头蚜/天/雌蜂，可达到352.5头。该蜂的内禀增长率则随寄主密度和寄生蜂的性比的变化而变化，在寄主密度100头蚜/天/雌蜂，寄生蜂性比0.6（♀/♂）下，可达到0.331.

关键词: 烟蚜茧蜂, 麦长管蚜, 生殖力, 内禀增长率

Abstract: The fecundity and reprodunctive rate of Aphidius gifuensis parasitizing second and third instar nymph of Sitobion avenae were studied at six different host densities at constant temperature and humidity.The result showed that at the host density lower than 40 aphids supplied to per female per day,the number of eggs laid increased with host density and the oviposition was restrained due to the lack of host.Above this host density,the parasitoid laid on average 493.3-587.5 eggs.The number of aphids parasitized also increased with the host density and at the host density of 100 aphids per female per day,it reached 352.5.The rate of intrinsic increase varied with the host density and sex retio and at the host density of 100 aphids per female per day and sex ratio of 60%(♀/),it reached the value of 0.331.

Key words: Aphidius gifuensis, Sitobion avenae, Fecundity, Rate of intrinsic increase

中图分类号: 

• S476.3