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The development, longevity and reproduction of Trissolcus basalis (Wollaston) and Telenomus podisi Ashmead were investigated under natural conditions during autumn and winter from 1999 to 2001, in Southern Paraná State, Brazil, in order to understand how these parasitoids overwinter in subtropical regions. Adults of T. basalis e T. podisi emerged during autumn and winter from eggs parasitized between April and June. Adult longevity in natural conditions was higher than eight and seven months, for T. basalis and T. podisi respectively, showing that both species overwinter in the adult stage. Percentage survival of T. basalis and T. podisi females during autumn and winter was higher than 85% and mortality increased significantly in spring. Females maintained for six months in natural conditions parasitized E. heros eggs after transference to 25 degrees C, and the presence of females in the offspring showed that mating occurred during autumn and winter. Temperature during immature development influenced significantly the adult performance, regulating the longevity and reproductive capacity after dormancy. Female parasitoids that developed in higher temperatures lived longer and parasitized more host eggs after transference to 25 degrees C than females that developed under colder conditions.

neotropical entomology/neotropical entomology

Desenvolvimento, longevidade e reprodução de Trissolcus basalis (Wollaston) e Telenomus podisi Ashmead (Hymenoptera: Scelionidae) em condições naturais durante a entressafra da soja no sul do Paraná