Abstract: To illustrate the influences of temperature on the development and reproduction of Chrysolina aeruginosa Faldermann, the development and fecundity of C. aeruginosa at five temperatures (13, 18, 23, 28 and 33℃) were investigated, with Artemisia sphaerocephala served as food. The results showed that temperature had significant effects on the developmental duration, survival rate and reproduction of C. aeruginosa. The developmental duration of every stage reduced with increasing temperatures from 13 to 28℃, and there was a positive relationship between developmental rate and temperature. Further increase of temperature to 33℃, however, was unfavorable to its larval and pupal development. The larval duration at 33℃ was significantly longer (P<0.05) than that at 18℃, 23℃ and 28℃, and the adult could not emerge from soil. Low temperature affected the survival rate of eggs while high temperature affected the pupal survival rate, suggesting that excessively low or high temperature was unfavorable to its survival. The oviposition amount of C. aeruginosa at different temperatures was significantly different (P<0.01) and varied in the order of 28℃＞23℃＞18℃＞13℃. Based on the direct optimal method, the developmental threshold temperatures for egg, 1st to 3rd instar larva, and 4th instar larva plus pupa were 9.72, 7.11, and 8.77℃, respectively, and the corresponding effective accumulated temperatures were 115.36, 441.91, and 448.40 degree-days, respectively. The results provide the basis for forecasting the occurrence of C. aeruginosa and are applicable in agricultural practices.

Key words: Chrysolina aeruginosa, developmental duration, survival rate, reproduction, developmental threshold temperature, effective accumulated temperature