| In order to clarify the population development of Chrysopa pallens feeding on Aphis craccivora, the life table was constructed under the conditions of 25℃±1℃, RH 55%±5%, 16 L∶8 D, and the impact of starvation on the food utilization rate was also studied. Results showed that the development duration of the egg, 1st, 2nd, 3rd instar larva and pupa were 3.03，3.10，3.39，4.43 and 12.52 d, respectively. The average longevity of female adults was 29.38 d, and the individual fecundity of female was 325.76 eggs. Intrinsic rate of increase (r), finite rate of increase (λ), net reproduction rate (R0) and mean generation period (T) of C. pallens were 0.1197 d^-1, 1.1076 d^-1, 68.41 eggs/individual and 41.36 d, respectively. At the same level of starvation, the food utilization rate of the 3 rd instar larvae was significantly higher than that of the 2nd instar, and with the increased duration of starvation, the food utilization rate of the 2 nd instar larvae and 3 rd instar larvae also gradually increased.The results showed that C.pallens could grow and develop normally feeding on A. craccivora at 25℃, which provided theoretical support that A. craccivora could be a suitable prey for C. pallens, and also provided basic data for the feeding situation of C. pallens when faced with the problem of food shortage when used for biological control in the field. |
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