东北地区四种本地赤眼蜂对草地贪夜蛾寄生能力及适应性研究

草地贪夜蛾Spodoptera frugiperda(Smith)是新入侵我国的重大危险性入侵害虫,赤眼蜂是我国生物防治的优势卵寄生蜂,可用于防治多种农林作物上的鳞翅目害虫。为检测东北地区本地赤眼蜂对草地贪夜蛾卵的生防潜能,筛选防治草地贪夜蛾的有效蜂种,本研究比较研究了松毛虫赤眼蜂、玉米螟赤眼蜂、黏虫赤眼蜂和稻螟赤眼蜂对草地贪夜蛾卵的寄生能力和发育适合度。结果表明,4种赤眼蜂均能寄生草地贪夜蛾卵,并完成发育,但其寄生能力和发育适合度存在显著差异。松毛虫赤眼蜂、玉米螟赤眼蜂和黏虫赤眼蜂对草地贪夜蛾卵块寄生率均高于80%,但仅松毛虫赤眼蜂对草地贪夜蛾卵表现出较高的卵粒寄生量。松毛虫赤眼蜂、玉米螟赤眼蜂和黏虫赤眼蜂子代羽化率和雌性比无显著差异,但松毛虫赤眼蜂比其它3种赤眼蜂的发育历期更短,而稻螟赤眼蜂对草地贪夜蛾卵的寄生能力和适合度均最差。研究结果将为应用本地赤眼蜂生物防治潜在入侵东北地区的草地贪夜蛾提供技术支撑。

Parasitism and suitability of Spodoptera frugiperda (Smith) eggs for four local Trichogramma species of northeastern China

Fall armyworm Spodoptera frugiperda(Smith)is a new invasive pest causing serious damages in China.Among egg parasitoids,Trichogramma are the dominant biological control agents that has been applied to control lepidopteran pests of crops,vegetables and forests worldwide.To evaluate the possibility and efficiency of local Trichogramma species of northeastern China on S.frugiperda eggs,we compared parasitism capabilities of Trichogramma dendrolimi Matsumura,T.ostriniae Pang&Chen,T.leucaniae Pang&Chen,and T.japonicum Ashmend under laboratory conditions.The results showed that all four Trichogramma species could accept S.frugiperda eggs and complete development successfully,but significant differences in fitness parameters were found among them.The parasitism of T.dendrolimi,T.ostriniae and T.leucaniae was higher than 80%on S.frugiperda egg masses,while only T.dendrolimi females supplied with S.frugiperda eggs performed higher parasitic number of eggs among all the tested species.Moreover,no significant differences in emergence rate and progeny female proportion among T.dendrolimi,T.ostriniae and T.leucaniae,but T.dendrolimi developed significantly faster on S.frugiperda eggs compared to other three species.Generally,T.japonicum performed poorly on S.frugiperda eggs in all aspects.The present study provides useful primary data for the application of local Trichogramma species against S.frugiperda those will invade northeastern China in future.