“…Second, species distribution depends on availability of resources (Lövei and Sunderland, 1996). P. cupreus preference for oilseed rape can be related to the larger amount of prey items found in oilseed rape (Haschek et al, 2012), especially agricultural pests such as the pollen beetle Meligethes aeneus (Stephens) (Veromann et al, 2008), Ceutorhynchus Germar weevils (Piper and Williams, 2004), the brassica pod midge Dasineura brassicae (Winnertz) (Schlein and Büchs, 2004) or slug eggs (Oberholzer and Frank, 2003). Similarly, as an ectoparasitoid, B. sclopeta is limited by the presence of its hosts.…”