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Bionomics of Diadromus sp. (Hymenoptera: Ichneumonidae), an internal and solitary pupal parasitoid, and the characteristics of its parasitism on diamondback moth, Plutella xylostella (L.)
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- URLhttps://db.koreascholar.com/Article/Detail/290346
Diamondback moth (DBM, Plutella xylostella L.), the most destructive pest of cruciferous crops, is well-known as typical subtropical insect pest. A number of biological agents such as diseases, parasites and predators can affect populations of DBM in the fields negatively. In previous reports, we suggested Cotesia glomerata, Diadegma semiclusum, and Microplitis plutellae as promising natural enemies to DBM control at highland areas, but these species are larval parasitoids. In 2004~2009, we searched highland fields cultivating various cruciferous crops for PUPAL parasitoids which can supplement the unsatisfactory parasitism in the augmentative release of larval parasitoids. We obtained adults of hymenopteran parasitoid from DBM pupae in early July at Hoengseong region (asl 540 m), and then identified as Diadromus sp., although being a critical species so far. This parasitoid showed high rate of parasitism, about 13.2%, in mid October at the same region. Development period from oviposition to emergence of Diadromus sp. ranged from 14 to 18 days under 23℃ condition. Adult longevity, > three weeks, was longer when it was provided with 10% sugar solution as food than with water only or without food. Male adults mated as soon as emerging from parasitized DBM pupae, and laid eggs into DBM pupae for a week. Parasitism by Diadromus sp. was highest on 7th day after emergence. In contrast, lethality of DBM pupae which were not parasitized by wasps showed 60% on average for seven days. Parasitized DBM pupae could be stored at 10℃ for two weeks. The simultaneous augmentative release of larval parasitoids and pupal parasitoids can be an important component to integrated DBM management program in the future.
