中文摘要：

采用四臂式嗅觉仪测定了长棒四节蚜小蜂(Pteroptrixlonggiclava(Girault)(Hymenoptera:Aphelinidae))和黄胸扑虱蚜小蜂(Encarsiagigas(Tshumakova)(Hymenoptera:Aphelinidae)),对健康的小青×黑杨(Populuspseudo-simonii×P.nigra)树皮、被杨圆蚧(Quadraspidiotusgigas(Thiem&Gerneck))危害的杨树皮、杨圆蚧1龄固定若虫的虫体和介壳的挥发油的趋性反应。测定结果表明:被杨圆蚧危害后的小青×黑杨树皮和杨圆蚧1龄固定若虫的介壳对长棒四节蚜小蜂和黄胸扑虱蚜小蜂成虫具有较大的吸引力。3~7mL介壳挥发油和5~9mL受害杨树皮挥发油对长棒四节蚜小蜂的寄主搜寻行为具有较强的引导作用。虫体的挥发油对小蜂的寄主定位也起到了一定的引诱作用。两种小蜂对健康树皮的挥发油几乎没有反应。图4表1参20。

英文摘要：

Four-armed airflow olfactometer was used to determining the foraging behavior of Pteroptrix longgiclava (Girault) (Hymenoptera: Aphelinidae) and Encarsia gigas (Tshumakova) (Hymenoptera: Aphelinidae) to the essential oils which emitted from the healthy bark of Populus pseudo-simonii ×P. nigra, the infested bark injured by Quadraspidiotus gigas (Thiem & Ger-neck), the body and scale of fixed 1st-instar-nymph of Q. gigas. The results from these experiments showed that the volatile oils produced from the injured bark and from the scale of fixed 1st-instar-nymph had a higher attractive ability to female adults of the two species of wasps. The essential oil produced from the scale of the pest at dosages of 3-7mL and the essential oil emitted by injured bark at dosages of 5-9 mL had a stronger alluring effect on the host searching behavior of Pteroptrix longgi-clava. The essential oil from the body of fixed 1st-instar-nymph of Q. gigas also had certain effect on the host locating effort of Pteroptrix longgiclava and Encarsia gigas. Those two wasps did not shown any reaction to the essential oil produced by the healthy bark of poplar.