Bt棉对斑痣悬茧蜂寄主选择及其子代发育的影响*

［目的］ 评价转Bt基因棉通过非靶标寄主斜纹夜蛾和甜菜夜蛾幼虫对寄生蜂的影响。［方法］ 分别采用选择性试验和非选择性方法，观察斑痣悬茧蜂对取食Bt棉叶和常规棉叶的斜纹夜蛾和甜菜夜蛾幼虫的产卵选择偏好，并观察子代蜂在不同处理幼虫体内的发育表现。［结果］ 取食Bt棉叶的斜纹夜蛾幼虫体重与取食常规棉叶的没有显著差异，而取食Bt棉叶的甜菜夜蛾幼虫体重显著小于取食常规棉叶。对斜纹夜蛾幼虫的选择性试验表明，斑痣悬茧蜂未表现出对取食Bt棉寄主幼虫的偏好。［结论］ 斑痣悬茧蜂子代的历期、存活以及羽化成蜂的体型大小等发育适应度特征，不受寄主幼虫所取食的食料植物的影响。

Effects of Bt-cotton on host selection and developmental performances of Meteorus pulchricornis

Objective] To evaluate the effects of Bt-cotton on parasitoids mediated by non-target hosts,Spodoptera litura and S.exigua.Method] The choice and non-choice experiments were conducted respectively in laboratory to study oviposition preference of Meteorus pulchricornis for Spodoptera litura and S.exigua larvae fed by Bt-or regular cotton leaves,and the developmental performances of offspring parasitoids were observed.Result] The host larvae fed with Bt cotton leaves were not different in body weight from ...