The effects of timing and dose of entomopoxvirus infection in Pseudaletia separata (Lepidoptera : Noctuidae) larvae on the development of Cotesia kariyai (Hymenoptera : Braconidae)

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The effects of the timing and dose of entomopoxvirus infection in Pseudaletia separata larvae on the devel-opment of a braconid larval parasitoid, Cotesia kariyai, were studied under laboratory conditions. The infection of larvae with an entomopoxvirus (PsEPV) was deleterious to the development and subsequent survival of C. kariyai. The survival and development of C. kariyai in PsEPV-infected P. separata larvae depended on the viral dose, timing of viral infection and the length of time between parasitization and viral infection. The percentage of hosts with emergence of C. kariyai decreased with increases in PsEPV concentration and in-creased with progressive inoculation stages of larvae. No parasitoid larvae emerged from PsEPV-infected hosts when host larvae were exposed simultaneously to parasitization and inoculation of lethal dose of PsEPV. Survival of C. kariyai in PsEPV-infected hosts increased as the time between parasitization and subsequent viral exposure was increased. The body length of parasitoid larvae developing in PsEPV-infected hosts de-creased as the inoculation dose of PsEPV was increased. Parasitized larvae were more susceptible to PsEPV than nonparasitized larvae, regardless of the timing of parasitization and viral inoculation.
1999-11-25