Abstract
In the outbreak of the pine moth Dendrolimus pini (Linnaeus, 1758) (Lepidoptera, Lasiocampidae) in Voronezh Oblast, mass infection of its pupae with the pupal parasitoid wasp, Aprostocetus xanthopus Nees, 1834 (Hymenoptera, Eulophidae), was revealed. It had destroyed from 7 to 25% of all phytophage pupae, which indicates its significant impact on the cocoon moth abundance. Previously, this parasitoid was frequently noted as an entomophage of the pine moth, but it has always been low in number. The biology of A. xanthopus has not been studied enough completely and this hampers its use as an agent of biological protection of pine forests from the pine moth.
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