Eur. J. Entomol. 91 (4): 477-479, 1994
Effect of temperature on the development and voltinism of the rice stem borer, Chilo suppressalis (Lepidoptera: Pyralidae) in Taiwan
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The effect of temperature on development of populations of the rice stem borer from Hsilo (23.8°N), Tounan (23.7°N) and Pingtong (22.7°N), Taiwan, was investigated. The development rates of these populations increased with increasing temperature from 20 to 30°C. The mean developmental periods of eggs, larvae, and male and female pupae in the Hsilo population were 7.7, 33.0, 7.6 and 7.1 days at 25°C under 14L : 10D photoperiod and the theoretical threshold temperatures for development were 8.9, 9.2, 10.4 and 10.5°C, respectively. Effective temperature sums for development were 124, 521, 111 and 103 day-degrees, respectively. These results suggest in Hsilo population that 4 or 5 generations occur annually in central and southern Taiwan. In the Tounan and Pingtong populations, which require lower effective temperature sums for larval development than the Hsilo population, 5 or 6 generations may occur in a year.
Keywords: Chilo suppressalis, Taiwanese rice stem borer, developmental rate, effective temperature sum, threshold temperature, voltinism, diapause, induction
Accepted: July 13, 1994; Published: December 20, 1994 Show citation
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