A bacterial cell transfected or genetically transformed in which said bacterium is an intestinal symbiont of an insect belonging to the order Thysanoptera, characterized in that said bacterial cell is transformed or transfected with nucleic acid to express dsRNA against at least a part of the tubulin gene or at least a part of the insect elongation factor gene.Una célula bacteriana transfectada o transformada genéticamente en la que dicha bacteria es un simbionte intestinal de un insecto que pertenece al orden Thysanoptera, caracterizada porque dicha célula bacteriana se transforma o se transfecta con ácido nucleico para expresar dsARN contra al menos una parte del gen de tubulina o al menos una parte del gen del factor de alargamiento del insecto.
