A mite parasitoid,Pyemotes zhonghuajia,negatively impacts the fitness traits and immune response of the fall armyworm,Spodoptera frugiperda

Parasitoids are key regulators in ecological communities and widely used as agents in biocontrol programmes.The fall armyworm,Spodoptera frugiperda,recently invaded multiple continents and caused substantial economic losses in agriculture.Pyemotes zhonghuajia,a newly identified mite parasitoid,has shown potential for controlling various agricultural insect pests.Therefore,this study tested the performance of P.zhonghuajia in parasitising S.frugiperda.We also investigated the sublethal effects of parasitism by P.zhonghuajia on host fitness traits,transgenerational impacts,and cellular and humoral immunity.Our result showed that the fifth-instar larvae of S.frugiperda parasitised by 40 P.zhonghuajia were all dead(i.e.,a lethal effect),while parasitism by 5 or 10 P.zhonghuajia was considered sublethal since many S.frugiperda survived to adulthood and produced offspring after mating.The sublethal influences from parasitism by P.zhonghuajia resulted in reduced pupal weight,adult emergence rate and fecundity,but increased developmental time and longevity.Parasitism at both lethal(40 mites)and sublethal(10 mites)levels impaired the cellular and humoral immunity of S.frugiperda.This study presents the first empirical evidence that mite parasitoids can negatively influence host immunity.Moreover,it provides insights into the biocontrol potential of mite parasitoids and their interactions with hosts.

中国广翼甲螨亚属一新种及一新纪录种(蜱螨亚纲:甲螨亚目:大翼甲螨科)（英文）

记述采自中国陕西省和贵州省的广翼甲螨亚属Flagellozetes(Cosmogalumna)1新种。该新种与分布在菲利宾的弗拉基米尔广翼甲螨Flagellozetes(Cosmogalumna)vladopesici Ermilov&Corpuz-Raros,2015相似,但区别在于:翅形体上不具有多边形网状结构;前背板中部具有不规则的突节;后背板中央孔明显。首次记录瑕饰广翼甲螨Flagellozetes(Cosmogalumna)ornata Aoki,1988在中国的分布。