Document Type

Article

Journal/Book Title/Conference

Enviornmental Entomology

Volume

16

Issue

4

Publication Date

8-1-1987

First Page

990

Last Page

995

Abstract

Postdiapause development rates and VO2 were determined in Trypoxylon politum maintained outdoors and in the laboratory under constant temperatures of 8, 14, 18, 22, 26, 30, and 34°C. This wasp may begin postdiapause development outdoors when the mean daily temperature is as low as 6-7°C if the temperature rises above the theoretical development threshold of 14.9°C for some time during the day. The wasp does not develop at constant temperatures of ::sl4°C, or at 2'34°C. The rate of development increases linearly with temperatures from 18 to 26°C, but declines at 300C. Prepupal respiratory rates increased significantly at 22°C; the rates of propupal and pupal stages increased at 26°C. Optimal development, with regard to energy utilization (respiration) occurred at 22°C. VO, and age exhibit a catenary relationship at temperatures at which development occurs. The total oxygen consumed during development exhibited a linear relationship with temperature from 22 to 30°C. Thermal accumulations acquired in completing development at 18, 22, and 26°C are very similar. The outside group's thermal acquisition was only 80% of the total at 18-26°C. At l8°C, development appeared to be complete, but wasps failed to eclose and died within the cocoon after reaching the adult stage.

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