Effects of Temperature on Developmental Rate of Trissolcus euschisti (Hymenoptera: Scelionidae), a Parasite of Stink Bug Eggs1

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Abstract
The effects of seven constant temperatures, ranging from 15 to 33°C, on the rate of development and emergence of Trissolcus euschisti (Ashmead) were determined, using Podisus maculiventris (Say) eggs as hosts. The effects of two fluctuating temperature regimes also were studied. Males developed faster than females, and both sexes developed successfully from egg to adult emergence at constant temperatures ranging from 18 to 33°C. Although neither sex emerged as adults at a constant temperature of 15°C, both sexes emerged successfully under the fluctuating regimes of 14°C/22°C and 21°C/33°C. The low and high constant temperatures used in this study reduced the percentage of successful emergence of adult parasites. Developmental rates and other biological characteristics of T. euschisti are compared with those of Telenomus podisi Ashmead, a sympatric scelionid parasite of pentatomid eggs.

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