菜蛾啮小蜂对寄主龄期的选择性和适合性

菜蛾啮小蜂是小菜蛾幼虫期至蛹期的跨期寄生蜂，也可仅寄生于蛹。室内寄主虫态及龄期选择寄生试验表明，该蜂嗜好产卵寄生幼虫，较少产卵寄生预蛹，很少产卵寄生蛹，但在幼虫４个龄期间无明显偏嗜性。寄生于各龄小菜蛾幼虫的啮小蜂在发育历期、蛹期存活率、每寄主育出蜂数及性比几方面无显著差异，表明各龄幼虫对该蜂的适合性基本一致

Host Stage Preference and Suitability of Oomyzus sokolowskii,A Major Larval-pupal Parasitoid of Plutella xylostella

Oomyzus sokolowskii is a larval-pupal parasitoid of the diamondback moth, Plutella xylostella, but may parasitize only the pupal stage of the host. In a host stage preference test in the laboratory, the parasitoid preferred to oviposit into host larvae, rarely oviposited into prepupae, and seldom oviposited into pupae. The parasitoid did not show any preference between larvae of the four instars. Parasitoids developing in different host instars did not exhibit significant differences in development time, survival rates of the pupae, number of resultant wasps per host pupa, and sex ratio, indicating similar host suitability between larvae of different instars.