草地贪夜蛾对四种蔬菜的胁迫取食和产卵偏好选择

为明确草地贪夜蛾 Spodoptera frugiperda 入侵种群是否对我国蔬菜生产构成威胁，以玉米Zea mays为参照，通过室内饲养观察比较分析草地贪夜蛾胁迫取食黄瓜Cucumis sativus、豇豆Vig-na unguiculata、番茄Solanum lycopersicum和菜心Brassica campestris这4种蔬菜后的生存能力和产卵选择性。结果表明，以黄瓜、番茄、豇豆和菜心嫩叶饲养的草地贪夜蛾幼虫存活率分别为30.56%、19.44%、20.83%和5.56%，显著低于玉米嫩叶饲养的幼虫存活率（75.00%）。综合分析幼虫发育历期、蛹历期、蛹重和羽化率，发现草地贪夜蛾在菜心上的适合度最低。产卵选择试验表明，草地贪夜蛾在番茄、豇豆和菜心上的产卵量分别仅为669.00、116.33和101.00粒，该虫更偏好于在玉米和黄瓜上产卵，产卵量分别达到2 522.33粒和2 948.00粒。表明虽然草地贪夜蛾幼虫和成虫在黄瓜、番茄、豇豆、菜心上的适合度显著低于玉米，但仍具有在黄瓜、豇豆、番茄和菜心上建立种群的能力，对我国蔬菜生产构成潜在威胁。

The feeding stress and oviposition preference of fall armyworm Spodoptera frugiperda to four species of vegetables

In order to find out whether the invasive population of Spodoptera frugiperda poses a threat to vegetable production in China, the viability and oviposition selectivity of Sp. frugiperda on four species of vegetables, Cucumis sativus, Vigna unguiculata, Solanum lycopersicum and Brassica campestris, were compared and analyzed, with Zea mays as a control. The results showed that the larval survival rates of Sp. frugiperda reared with tender leaves of C. sativus, So. lycopersicum, V. unguiculata and B. campestris were 30.56%, 19.44%, 20.83% and 5.56%, respectively, which were significantly lower than those fed with Z. mays tender leaves (75.00%). Further analysis of larval duration, pupa duration, pupa weight and eclosion rate showed that Sp. frugiperda had the lowest fitness on B. campestris. Sp. frugiperda preferred laying eggs on Z. mays (no. of eggs: 2 522.33) and C. sativus (2 948.00), to So. lycopersicum (669.00), V. unguiculata (116.33) and B. campestris (101.00). The results indicated that the fitness of larvae and adults on four species of vegetables was significantly lower than that on Z. mays, but the pest could still establish population on tested vegetables, and thus poses a potential threat to vegetable production.