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The whitefly Bemisia tabaci complex contains many cryptic species,of which the Middle East-Asia Minor 1(MEAM1)and Mediterranean(MED)are notorious invasive pests.In China,MEAM1 harbors an obligate primary symbiont “Candidatus Portiera aleyrodidarum” and two secondary symbionts,“Candidatus Hamiltonella defensa” and Rickettsia sp.,whereas MED has only “Ca.Portiera aleyrodidarum” and “Ca.Hamiltonella defensa”.Both “Ca.Portiera aleyrodidarum” and “Ca.Hamiltonella defensa” are intracellular endosymbionts residing in the bacteriomes,whereas Rickettsia sp.has a scattered distribution throughout the host body cavity.We examined responses of these symbionts to adverse temperatures as well as survival of the host insects.