【目的】 本研究采用低剂量的⁶⁰Co-γ射线辐照梨小食心虫 Grapholita molesta雄蛹，分析辐照对梨小食心虫繁殖的影响，为利用⁶⁰Co-γ射线防治梨小食心虫提供理论依据。【方法】 设置辐照剂量为0、25、50和75 Gy的⁶⁰Co-γ射线对梨小食心虫羽化前1 d的雄蛹进行辐照处理，分析辐照对其羽化率、繁殖能力及寿命的影响。【结果】 不同辐照剂量处理的梨小食心虫羽化率均有下降，但与对照组相比无显著性差异，说明辐照对其羽化率影响较小。辐照组雄蛾与正常雌蛾的交配率与对照组无显著性差异。与对照组相比，经25、50和75 Gy辐照处理羽化的雄蛾与正常雌蛾交配后，其单雌产卵量无显著性差异。随着辐照剂量的升高，梨小食心虫的孵化率逐渐下降。与对照组孵化率74.38%±6.15%相比，75 Gy处理组的孵化率明显降低，仅为22.68%±7.20%。与对照组相比，随着辐照剂量的升高，辐照组雄虫的平均寿命均有不同程度的下降。【结论】 利用低剂量的⁶⁰Co-γ射线辐照可影响梨小食心虫繁殖，为进一步优化辐照条件和利用⁶⁰Co-γ射线防治梨小食心虫提供理论指导。

[Objectives]  To provide a theoretical basis for the use of ⁶⁰Co-γ ray irradiation to control Grapholita molesta.  [Methods]  Male G. molesta pupae were irradiated with 0, 25, 50, 75 Gy of  ⁶⁰Co-γ rays one day before emergence and the effects on adult emergence rate, fertility and longevity, were analyzed. [Results]  There was no significant difference in the adult emergence rate, or mating rate, of irradiated and control adults. The number of eggs laid by adult females mated with irradiated males was also not significantly different to that of females that mated with non-irradiated males. However, the hatching rate of eggs laid by females that mated with irradiated males decreased gradually as the level of irradiation increased and the hatching rate of the 75 Gy treatment group (22.68%±7.20%) was significantly lower than that of the control group (74.38%±6.15%). The average life span of males in irradiation treatment groups was also lower than that of control males. [Conclusion]  Irradiation with low dosage of ⁶⁰Co-γ reduced reproductive parameters of G. molesta. These results provide a guide for further optimization of irradiation conditions and the use of ⁶⁰Co-γ radiation in the management of this pest.