Abstract

Developmental times for the immature stages of four species of endoparasitoids of Heliothis virescens (F.), Microplitis croceipes (Cresson), M. demolitor Wilkinson, Cotesia kazak (Telenga), and Hyposoter didymator (Thunberg), were studied at 20, 23, 25, 27, 30, 32, and 35°C. The responses of M. croceipes and H. didymator to increases in temperature were significantly different from each other ( P 0.05; F = 0.58; df = 1, 18). The developmental temperature optima were 33°C for M. croceipes , 31°C for C. kazak and M. demolitor , and 29°C for H. didymator.

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