【目的】 为了明确不同世代的梨小食心虫Grapholita molesta (Busck)如何应对不同寄主进行产卵地点的选择。【方法】 本文以受孕雌虫为研究对象，在室内进行受孕雌虫产卵对不同种类（桃、梨和苹果）的寄主嫩捎和果实的选择性试验。【结果】 结果表明：（1）不同世代的受孕雌虫的产卵地点受到不同寄主种类的显著影响。越冬代、第2代和第3代受孕雌虫偏爱在梨果、桃梢上产卵，而第1代受孕雌虫偏爱在桃果和梨果上产卵。苹果梢和果实的引诱率最低。（2）卵的孵化率的变化趋势与受孕雌虫的落卵率一致。除了不同世代受孕雌虫在梨果上产的卵的孵化率存在差异以外，卵孵化率在同一世代的不同寄主果实、不同寄主嫩梢以及同一寄主的不同世代间差异不显著。【结论】 因此，桃梢稳定吸引梨小食心虫产更多的可育卵，而桃果仅吸引第1代成虫产较多的可育卵，梨果吸引其余3代成虫产较多的可育卵。可见，梨小食心虫的产卵选择行为具有试探性，为后代占据优势生态位提供保障。

 [Objectives]  In order to clarify how four generations of Grapholita molesta select oviposition sites on different host plants. [Methods]  The oviposition preferences of gravid females for the tender shoots and fruits of different hosts, including peach, pear and apple, were determined under laboratory conditions. [Results]  Different generations of gravid females had significantly different oviposition site preferences. Overwintering, second, and third, generation females preferred pear fruit and peach shoots, whereas the first generation females preferred peach and pear fruits. Apple shoots and fruits were the least preferred oviposition sites. Egg hatching and laying rates were consistent with female oviposition preferences. Although the egg hatching rates of different generations on pear fruits differed significantly, there were no significant differences in the egg hatching rates of different generations on other host fruits or host shoots. [Conclusion]  Peach shoots only attract first generation females whereas pear fruits attract the other three generations of female moths and consequently contain more fertile eggs. Different generations of female Grapholita molesta differ in their oviposition preferences in order to ensure a superior econiche for their offspring.