Phradis interstitialis (parasitoid)
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Phradis interstitialis (parasitoid) (Thomson, 1889)
This wasp is an important endoparasitoid of the pollen beetle (Brassicogethes aeneus) in Europe. It is widely distributed, mainly in northern and eastern parts of Europe. Females are attracted to oilseed rape flowers infested by the pollen beetle and parasitise its eggs and first instar larvae.
The parasitoid completes its development within the pupal cocoon of the pollen beetle host. The freshly emerged adult parasitoid overwinters within the cocoon in the soil and emerges in the spring. Therefore, soil cultivation before the parasitoid emergence will reduce its survival (Williams, 2006).
P. interstitialis is very similar to Phradis morionellus, both in morphology and biology. Both species have been confused in the past.