Listrodromus nycthemerus (parasitic wasp)

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One species which is host specific, and can have a massive impact on populations of the prey, is Listrodromus nycthemerus (11mm). This targets Holly Blue butterfly caterpillars, laying its egg in first instar larvae. This results in the emergence of a single adult wasp from the normally formed Holly Blue pupa. Parasitism of larvae can reach 99%, understandably causing a massive collapse in host populations. Listrodromus nycthemerus can take six or seven years to reach peak numbers, which together with its effectiveness as a parasite helps explain why the Holly Blue is subject to noticeable ‘booms and busts’…Nature Conservation 

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at last managed to get some good photos if it

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