摘要Understanding the thermal dynamics of host-parasitoid interactions is crucial to predicting how biological control of pest insects by parasitoids might be affected by geographic location and climate change.We compared performance traits of Plutella xy-lostella(Lepidoptera:Plutellidae)and its solitary endo-larval parasitoid Diadegma semi-clausum(Hymenoptera:Ichneumonidae),over a wide range of constant rearing tempera-tures(10-30℃).Parasitoids reared at 30℃experienced reductions in pupation rate,pupal mass,egg load,and adult life span when compared with those reared at lower tempera-tures.Our analyses of the fate of parasitoids and their hosts and intergenerational popula-tion growth at different rearing temperatures show that D.semiclausum and P xylostella respond differently to temperature,leading to divergent outcomes under different tempera-ture conditions.Some parasitoid larvae could not complete development at 30℃,the tem-perature at which the host biomass was least and the metabolic demands of the parasitoid could be high,suggesting that parasitoid development might be constrained by lack of host resources at higher temperatures.We discuss the potential mechanisms of parasitoid susceptibility to elevated temperatures,which likely explain the pronounced seasonal dy-namics of D.semiclausum in subtropical regions and its failure to establish in lowland tropical regions,where P xylostella is a serious pest.Similar interactions in other host-parasitoid associations would constrain the efficacy of parasitoids as biological control agents as global temperatures increase.