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Laboratory studies were conducted on the effect of temperature and host instar on lifetime and age-speciÞc fertility of honey-fed and starved adults of Venturia canescens Gravenhorst (Hymenoptera: Ichneumonidae) parasitizing larvae ofEphestiakuehniella Zeller (Lepidoptera: Pyrali- dae). The relationships between the number of progeny produced with adult longevity and body size also were investigated. Highest mean fertility of honey-fed wasps was recorded at 20C, followed, in decreasing order, by 25, 30, and 15C, with most offspring emerging during the Þrst 5 d. In contrast, temperature did not have a strong effect on progeny production in the case of starved adults. Provision of adult parasitoids with honey resulted in a signiÞcant increase in production of total offspring at all temperatures. Wasps that parasitized second-instar hosts produced signiÞcantly fewer descendants than those that oviposited in third- to Þfth-instar hosts, which produced similar numbers of offspring. Interactions between temperature and feeding were signiÞcant. The total number of offspring produced by honey-fed adults increased with longevity and body size, regardless of temperature or host instar. Conversely, number of progeny produced by starved wasps was correlated only with body size.

environmental entomology

Effects of Temperature, Host Instar, and Adult Feeding on Progeny Production by the Endoparasitoid<i>Venturia canescens</i>(Gravenhorst) (Hymenoptera: Ichneumonidae)

Effects of Temperature, Host Instar, and Adult Feeding on Progeny Production by the EndoparasitoidVenturia canescens(Gravenhorst) (Hymenoptera: Ichneumonidae)