We examined the survival and development of the endoparasitoid Venturia canescens in a Bt-tolerant laboratory strain of the flour moth Ephestia kuehniella, in which Bt-tolerance has been shown to be associated with an inducible elevation of the insect's immune response. The results indicate the elevated immune status associated with Bt-tolerance does not confer cross-protection against parasitism by V canescens. No significant difference was observed in the rate of emergent wasps from parasitised Bt-tolerant and Bt-susceptible hosts. In addition, wasps from Bt-tolerant hosts had longer development times and were larger than wasps from Bt-susceptible hosts. [copyright] 2004 Elsevier Inc. All rights reserved. Ephestia kuehniella (Pyralidae) : Host Venturia canescens (Ichneumonidae) : Parasite Life cycle and development; Parasites diseases and disorders; Parasites; Insect parasites; Hosts; Insect hosts Ephestia kuehniella; Hymenopteran parasites; Parasite development in Bt-tolerant laboratory strain; Venturia canescens Venturia canescens; Development; Lepidopteran hosts; Parasite development in Bt-tolerant laboratory strain; Ephestia kuehniella none