A preliminary study on temperature tolerance ability of Calliptamus italicus

The supercooling points of all stages of Calliptamus italicus and body temperature regulation and the heatresisting ability of adults were measured for the first time in 2013. The results showed that supercooling points of each life stage of C. italicus followed normal distribution. And supercooling points and freezing points of different life stages were different. The wintering eggs had the lowest supercooling point and freezing point (P0.05) while the third instar nymphs had the highest supercooling point (P0.05). There was no significant difference of supercooling point among other instars or between the male and female of the adults. When ambient temperature (Ta) was 41 ℃, LT50 and LT90 of the female and male adults were the longest, which were 623.83, 1 604.98 and 459.52, 1 181.97 h，respectively. Adult body temperature (Tb) and Ta showed a very significant linear relationship (P0.01). When Ta rose by 0.5 ℃min-1, the Tb rise rate was 0.30~0.36 ℃min-1, and the body temperature rise rate of male adults was 0.36 ℃min-1, which was significantly higher than that of its female adults (0.30 ℃min-1).