Density-dependent-parasitism
Guides
Exenterus
Exenterus is a genus of parasitoid wasps in the family Ichneumonidae, subfamily Tryphoninae, first described by Hartig in 1837. The genus contains species that are specialized parasitoids of sawflies in the family Diprionidae, with documented hosts including Neodiprion sertifer, N. swainei, N. autumnalis, Diprion sertifer, and Zadiprion falsus. Several species have been introduced across continents for biological control of pine sawfly pests. The genus exhibits notable morphological diversity in egg structure, with European species showing an evolutionary gradient from simple to highly specialized stalked eggs that correlates with climatic tolerance and biological control success.
Mallophora
Bee-killers
Mallophora is a genus of large, robust robber flies (family Asilidae) commonly known as bee-killers. The genus contains approximately 60 described species distributed primarily in the Americas. Adults are powerful aerial predators that capture bees and other insects in flight, while larvae of at least some species are solitary ectoparasitoids of scarab beetle larvae (white grubs) in soil. Mallophora ruficauda, the best-studied species, is a significant pest of apiculture in the Pampas region of Argentina, where adults prey on honey bees, yet the same species functions as a beneficial biological control agent of agricultural pests through its larval parasitism of scarab grubs.