Developmental Models for Trichogramma pretiosum (Hymenoptera: Trichogrammatidae) Reared on Four Hosts1

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Abstract
The poikilotherm and degree-day methods were used to model the developmental rate of the parasitoid Trichogramma pretiosum on eggs of four host species. Predictions of both models agreed closely with observed data for temperatures from 20 to 30°C, but at 15°C the degree-day predictions of emergence were 5 to 7 days late. The degree-day models were much easier to develop and appear acceptable for predictions, using field temperatures normally expected during the cotton-growing season. The poikilotherm model provides an important tool in understanding the biology of T. pretiosum over broad temperature ranges. Suggested uses of these models are planning and interpreting experiments, scheduling rearing conditions, and determining possible causes of variability in insect cohort emergence due to temperature fluctuations.

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