Using sex pheromone can suppress the insect population by attracting male insects and disturbing mating of insects.The effects of host sex pheromone on egg parasitoids and whether it could be used synergistically with egg parasitoids are not known.In this study,the parasitisms of host eggs sprayed with different concentrations of sex pheromone compound of Chilo suppressalis by Trichogrammajaponicum were investigated in the laboratory and parasitisms by Trichogramma wasps in the field with and without host sex pheromone lures were compared.The results indicated that sex pheromone of C.suppressalis significantly affected parasitization of host eggs by T.japonicum.When the concentration of sex pheromone increased from 0.01 μg/μL to 10 μg/μL,the parasitism decreased from 50.29％ to 1.71％.Parasitism of host eggs treated with host sex pheromone was lower than that in control.However,the female proportion of Trichogramma offspring was not affected by the sex pheromone.The trap lure affected the parasitism of egg mass of C.suppressalis by Trichogramma in the field.Parasitism by T.japonicum was higher in egg masses far from trap lure than that near the trap lure.The trap lure attracted natural T.dendrolimi and T.ostriniae.These results indicate that sex pheromone of C.suppressalis affects the parasitizaiton of T.japonicum and the reaction of Trichogramma to trap lure of C.suppressalis are different among Trichogramma species.%性信息素可用于田间诱集雄虫,干扰雌、雄虫的交配从而抑制害虫种群,但田间应用性信息素对昆虫的寄生性天敌是否产生影响,能否和卵寄生蜂协同利用,尚不明确.本文在室内测定了二化螟性信息素混合物对稻螟赤眼蜂寄生能力的影响,在田间定点挂放寄主卵并释放稻螟赤眼蜂,比较了有无二化螟性诱剂诱芯存在时寄主卵被寄生的情况.结果发现二化螟性信息素混合物影响稻螟赤眼蜂的寄生.当混合物浓度从0.01 μg/μL升高到10 μg/μL时,供试米蛾卵被寄生率从50.29％下降到1.71％,均显著低于对照的62.14％.寄生发生后,赤眼蜂子代的雌性比不受性信息素浓度的影响,子代雌性比在45.9％～87.0％,与对照77.8％无显著差异.田间挂放二化螟性信息素诱芯影响了释放的稻螟赤眼蜂对二化螟卵的寄生率.远离诱芯位置的卵块的被寄生率高于距离诱芯近的卵块,但挂放诱芯吸引了自然界中的松毛虫赤眼蜂和玉米螟赤眼蜂.以上结果显示二化螟性信息素影响了稻螟赤眼蜂的寄生,但不同种赤眼蜂对二化螟诱芯的反应不同.
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