Objective To clarify the effects of different temperatures on the growth, development and fecundity of C. juglandicola.
Methods This study constructed life tables for C. juglandicola populations under seven temperature gradient conditions: 15, 18, 21, 24, 27, 30 and 33 ℃.
Results Under 15 and 33 ℃ conditions, the mortality rate of C. juglandicola significantly increases from the third instar, with all fourth-instar individuals dying before completing their life cycle. The developmental duration reaches a maximum of 13.59 days at 18 ℃ and a minimum of 9.96 days at 24 ℃. Reproductive capacity reached a maximum of 9.77 heads at 24 ℃ and a minimum of 3.92 heads at 30 ℃. Survival rates initially rise but then decrease with temperature increases. Developmental rates also show an upward trend followed by a decline, with 15 and 33 ℃ significantly inhibiting C. juglandicola growth. Intrinsic growth rates at 18, 21, 24, 27, and 30 ℃ were 0.10, 0.09, 0.15, 0.12 and 0.10, respectively, while average generation cycles were 9.37, 9.37, 5.47, 4.97 and 15.60 days. At 24 ℃, intrinsic growth rate peaked at 0.15.
Conclusion When the temperature is at 15 and 33 ℃, C. juglandicola cannot complete the life history, when the temperature is at 24 ℃, the fecundity is the largest. Intrinsic growth rate is the highest. Therefore, 24 ℃ is the optimal temperature for the growth and development of walnut aphids C. juglandicola.
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