Abstract: The erythrina gall wasp, Quadrastichus erythrinae Kim, is an important quarantine pest. It has caused severe damage in Singapore, Mauritius, Reunion, American Hawaii, Chinese Taiwan, and recently in Chinese continental Shenzhen. The bionomics of the erythrina gall wasp was systematically observed and studied both in field and in the laboratory. The results indicated that adult activity, longevity, mating and oviposition of the wasp were related significantly to temperature and light, in which they were living. The female longevity was prolonged by supplementary nutrition, but the male not. The sex ratio also changed with environmental temperature. The average number of eggs born per female were 275.8. The fecundity and the oviposition rate, highest at 30℃, were 203.63 eggs and 73.83%, respectively. The thermal threshold and the effective accumulated temperature for the development were 13.37℃ and 458.27 degree-days respectively. The developmental duration was interrelated negatively with temperature (r**=-0.9161).

Key words: Erythrina gall wasp, coral tree, thermal threshold, developmental duration, behavior