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采用四臂式嗅觉仪测定了长棒四节蚜小蜂(Pteroptrix longgiclava(Girault)(Hymenoptera:Aphelinidae))和黄胸扑虱蚜小蜂(Encarsia gigas(Tshumakova)(Hymenoptera:Aphelinidae)),对健康的小青×黑杨(Populus pseudo-simonii×P.nigra)树皮、被杨圆蚧(Quadraspidiotus gigas(Thiem & Gerneck))危害的杨树皮、杨圆蚧1齿固定若