Performance in Survival, Development and Reproduction of Aphis glycines Matsumura Virginoparae at High Temperatures

The soybean aphid, Aphis glycines Matsumura, is an important pest of soybean, which is native to Asia. In this study,A. glycines fed on soybean（Ag FS） and A. glycines fed on wild soybean（Ag FW） were reared at 25℃, 27℃, 29℃, 31℃, 33℃ and 35℃, respectively, and some of the life parameters were determined. At temperature ranging from 25℃ to 31℃, nymphs of Ag FS and Ag FW all developed into adults successfully. Only a few nymphs of Ag FS and Ag FW developed into adults at 33℃ and no nymphs could develop into adults at 35℃. Lifespan, fecundity and body size of Ag FS and Ag FW adults all decreased gradually with temperatures increasing from 25℃ to 33℃. At 25℃, the intrinsic rate of increase of Ag FS was as big as that at 27℃, which was smaller than that at 29℃, but was bigger than that at 31℃. Intrinsic rate of increase of Ag FW decreased gradually with temperatures increasing from 25℃ to 31℃. Nymph stage duration of Ag FW was longer than or as long as that of Ag FS; adult lifespan of Ag FW was shorter than or as long as that of Ag FS. Adult fecundity, intrinsic rate of increase and adult body size of Ag FW were all smaller than or as big as those of Ag FS. It showed that Ag FS and Ag FW both survived and developed well at temperature ranging from 25℃ to 31℃, and Ag FW was more adaptive to low temperatures. These results were important to study the adaptability of A. glycines to high temperatures and for predicting its dynamics in the temperature keeping rising region.