Abstract: To increase the reproduction rate of Spathius agrili Yang (Hymenoptera: Braconidae), an effective larval parasitoid of emerald ash borer, Agrilus planipennis, in China, the effects of different temperatures (22, 24, 26, 28, 30 and 32℃) on the development and reproduction of this wasp were investigated in the laboratory. The results showed that the developmental rate of egg, pupa and the whole generation of S. agrili increased with the increase of temperature from 22℃ to 32℃, but the highest developmental rate of larva was at 26℃. The developmental threshold temperatures required by egg, larva, pupa and whole generation were 14.34, 16.89, 14.16 and 13.84℃, respectively, while the effective accumulated temperatures were 24.59, 61.16, 166.27 and 276.80 degree-days, respectively. Temperature had effects on the parasitism rate, the rate of successful parasitism, number of eggs laid, the number of wasps and the sex ratio of the offspring with different degrees. It is so proposed that the suitable temperature for artificial rearing of S. agrili ranges from 26℃ to 28℃.

Key words: Spathius agrili, Agrilus planipennis, temperature, development, reproduction, parasitism