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 (AgFS) and A. glycines fed on wild soybean (AgFW) 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 AgFS and AgFW all developed into adults successfully. Only a few nymphs of AgFS and AgFW developed into adults at 33℃ and no nymphs could develop into adults at 35℃. Lifespan, fecundity and body size of AgFS and AgFW adults all decreased gradually with temperatures increasing from 25℃ to 33℃. At 25℃, the intrinsic rate of increase of AgFS 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 AgFW decreased gradually with temperatures increasing from 25℃ to 31℃. Nymph stage duration of AgFW was longer than or as long as that of AgFS; adult lifespan of AgFW was shorter than or as long as that of AgFS. Adult fecundity, intrinsic rate of increase and adult body size of AgFW were all smaller than or as big as those of AgFS. It showed that AgFS and AgFW both survived and developed well at temperature ranging from 25℃ to 31℃, and AgFW 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.