Parasitoids face challenges by switching between host species that influence survival and fitness, determine their role in structuring communities, influence species invasions, and affect their importance as biocontrol agents. In the generalist parasitoid, Venturia canescens (Gravenhorst) (Hymenoptera: Ichneumonidae), we investigated the costs in encapsulation, survival, and body size on juveni...

The interference ideal free distribution (IFD) model of Sutherland makes a number of predictions that have yet to be tested and that have implications for the validity of subsequent extensions to the theory. We tested these predictions in a study using different densities of the parasitoid wasp, Venturia canescens, foraging on patches containing different densities of its host, Plodia interpunc...

Vitellin (Vt) was found not to be critical to the formation or structure of yolk spheres in oocytes of the moth, Plodia interpunctella (Hubner). Vitellogenic activities of the follicular tissues were determined by visualizing the immunocytolocalization of Vt subunits (YP1 and YP3) and of a follicular epithelium yollc protein (FEYP) subunit (YP2) in ultrathin sections or in whole-mounted tissues...