Chrysocharis laricinellae (parasitoid)
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Chrysocharis laricinellae (parasitoid) (Ratzeburg, 1848)
This wasp is native to Europe and has been released in North America in the 1930s against the birch leaf-mining sawfly (Heterarthrus nemoratus) as well as the larch casebearer, Coleophora laricella (Bartlett et al., 1978). It parasitises both hosts in Europe.
C. laricinellae is a solitary endoparasite. Females feed on the host before oviposition and feeding alone can account for significant mortality among the host larvae. On H. nemoratus the parasitoid completes 1-2 generations per years, on C. laricella 2-3 generations. The fully grown larva is the overwintering stage.