泽兰实蝇雌成虫的寄主选择行为

Host selection behavior of female adults of Procecidochares utilis( Diptera: Tephritidae)

【背景】泽兰实蝇是紫茎泽兰的专性寄生天敌,已成为控制紫茎泽兰的重要因子。泽兰实蝇的寄主选择力对其控制紫茎泽兰至关重要,但相关报道还很少。【方法】采用"Y"形嗅觉仪在实验室内测定泽兰实蝇雌成虫对寄主植物——紫茎泽兰及其他植物的选择行为,以及紫茎泽兰受重金属胁迫后泽兰实蝇对其选择的变化。【结果】不同日龄的泽兰实蝇雌成虫对紫茎泽兰的选择性不具有显著差异;交配与否对雌成虫的寄主选择没有显著影响;雌成虫对紫茎泽兰的选择显著高于黄蒿、水葫芦和蓝花鼠尾草等非寄主植物;雌成虫对花期及机械损伤的紫茎泽兰选择更显著;紫茎泽兰经重金属镉(Cd)、铅(Pb)和锌(Zn)单一及复合处理后,泽兰实蝇雌成虫对其选择性显著降低。【结论与意义】泽兰实蝇雌成虫的寄主选择性随植物种类、寄主植物(紫茎泽兰)的生育期、健康状况及重金属胁迫而变化,这有助于更好地利用泽兰实蝇控制紫茎泽兰。

[Background] Procecidochares utilis Stone is an obligatory parasite of Eupatorium adenophorum Spreng, and it has be-come an important factor in the control of E.adenophorum.The host selection of P.utilis adults is very important to control the growth of E.adenophorum, but few related studies are reported at present.[Method] The selection behavior of P.utilis female adults was tested using a Y-tube olfactometer on E.adenophorum, a selection of plants and E.adenophorum plants that were exposed to heavy metals.[Result] The selection behavior of P.utilis female adults of different ages on E.adenophorum showed no significant differ-ence.Mating or not had no significant effect on host selection for the female adults.The choice of female adults on E.adenophorum was significantly higher than that of Artemisia carvifolia, Eichhornia crassipes and Salvia farian ec a.The female adults preferred E.da -enophorum in bloom or with mechanical damage.The selectivity of female adults decreased significantly if E.adenophorum plants were first exposed to Cd, Pb and Zn or a combination of them.[Conclusion and significance] The study showed selection behavior of P.utilis varied with plant species and development stage, health or level of contamination of the plants.This information can help establish a theoretical foundation for developing control mechanisms of E.adenophorum by using P.utilis.