云南省德宏州发现3种草地贪夜蛾幼虫寄生蜂

重大迁飞性害虫草地贪夜蛾Spodoptera frugiperda(J.E.Smith)自2019年1月入侵我国以来,已对我国粮食安全构成重大威胁。为加速对我国草地贪夜蛾寄生性天敌资源的发掘与防治潜能的评估,我们于2019年9月-11月对云南省德宏州玉米和小麦上草地贪夜蛾的寄生性天敌开展田间调查并对采集到的天敌进行分子鉴定。共发现3种草地贪夜蛾幼虫寄生蜂,分别为斯氏侧沟茧蜂Microplitis similis Lyle、半闭弯尾姬蜂Diadegma semiclausum Hellen和斜纹夜蛾长距姬小蜂Euplectrus laphygmae Ferrière,田间最高自然寄生率分别为12.00%、22.30%和5.33%。另外,田间调查发现在玉米和大豆上斯氏侧沟茧蜂还可寄生与草地贪夜蛾同属的斜纹夜蛾S.litura幼虫;在大豆和杂草上斜纹夜蛾长距姬小蜂可寄生甜菜夜蛾S.exigua幼虫。本研究将为今后开展草地贪夜蛾天敌昆虫的保护和利用提供重要参考。

Three larval parasitic wasps of Spodoptera frugiperda were found in Dehong prefecture of Yunnan province

As a major migratory pest, fall armyworm, Spodoptera frugiperda (J.E.Smith), has invaded in China in January 2019, and posed a great threat to food security of China. In order to accelerate the discovery of parasitic natural enemies and evaluate their control potential for S.frugiperda in China, the occurrence of larval parasitoids of S.frugiperda on maize and wheat was investigated in Dehong prefecture of Yunnan province from September to November in 2019 and their species were identified using molecular method. Totally three larval parasitic wasps of S.frugiperda were found, including Microplitis similis Lyle,Diadegma semiclausum Hellen and Euplectrus laphygmae Ferrière, with the highest natural parasitism rates of 12.00%, 22.30% and 5.33%, respectively. Moreover, the field investigation found that the M.similis could parasitize the larvae of S.litura on maize and soybeans, and E.laphygmae could also parasitize the larvae of S.exigua on soybeans and weeds. This study provides important reference for the natural protection and utilization of natural enemies of S.frugiperda in future.