甜菜夜蛾对白粉菌侵染的中国月季的嗅觉行为研究

采用Y型嗅觉仪测试了白粉菌侵染中国月季对甜菜夜蛾成虫嗅觉行为的影响及这种影响的空间效应。根据反应虫数分析,健康叶片挥发性成分对甜菜夜蛾成虫有显著的引诱作用（P=0.002）,同时感病叶片挥发性成分对雌蛾有显著的驱避作用（P=0.006）,直接比较2种叶片时差异更显著（P=0.000）。通过植物介导,中国月季感染白粉菌对甜菜夜蛾成虫产卵地的选择有明显抑制作用。进一步的空间效应研究结果显示,这种抑制作用存在局部效应和系统效应,能在同小叶内传递,并能向上或向下传递至同叶轴的其他相邻小叶。该研究为甜菜夜蛾成虫产卵地选择机制的深入研究提供了重要依据。

Study on Olfactory Behavior of Spodoptera exigua on Rosa chinensis Infected by Podosphaera pannosa

The influence and its spacial effect of Podosphaera pannosa-infection on Spodoptera exigua adult on Rosa chinensis plant were determined by using olfactometer.According to the number of response insects,the beet armyworm moths were significantly attracted by the volatiles emitted from healthy leaf tissues of roses(P=0.002),while the females were obviously repelled by the volatiles emitted from infected leaves(P=0.006),when compared to the clean air control.And the moths showed the significant differences between healthy and infected leaves(P=0.000).Therefore,the female's choosing for oviposition site was significantly inhibited by P.pannosa-infection.Further bioassays were conducted to elucidate the spacial scale of the effect of this inhibition.In consequence,the obviously local and systemic effects were found: the local effect expanded within one leaf and the systemic effect expanded one leaf position up and down.The study will provide further basis for further study on selection mechanism of oviposition.