An active composition comprising (A) at least one derivative of formula (I) in which T represents an oxygen atom and X is selected from the list of 2-isopropyl, 2-cyclopropyl, 2-tert-butyl, 5-chloro- 2-ethyl, 5-chloro-2-isopropyl, 2-ethyl-5-fluoro, 5-fluoro-2-isopropyl, 2-cyclopropyl-5-fluoro, 2-fluoro-6- isopropyl, 2-ethyl-5- methyl, 2-isopropyl-5-methyl, 2-cyclopropyl-5-methyl, 2-tert-butyl-5-methyl, 5-chloro-2- (trifluoromethyl), 5-methyl-2- (trifluoro-methyl), 2-Chloro-6- (trifluoromethyl), 3-chloro-2-fluoro-6- (trifluoromethyl) and 2-ethyl-4,5-dimethyl, or an agrochemically acceptable salt thereof, and (B) at least one other compound B insecticide or acaricide or active nematicide, selected from: aldicarb; chlorpyrifos; thiodicarb; metiocarb; ethiprole; fipronil; β-ciflutrin; deltamethrin; transflutrin; teflutrin; l-cyhalotrin; acetamiprid; clothianidine; imidacloprid; thiacloprid; thiamethoxam; spiny spinetoram; abamectin; flonicamid; spirotetramat; chlorantraniliprol; Ciantraniliprol; flupiradifurone; flubendiamide; sulfoxaflor; (27,31) 1- (3-Chloropyridin-2-yl) -N- [4-cyano-2-methyl-6- (methylcarbamoyl) phenyl] -3 - {[5- (trifluoromethyl) -2h-tetrazol- 2-yl] methyl} -1h-pyrazol-5-carboxamide + (27.32) 1- (3-chloropyridin-2-yl) -N- [4-cyano-2-methyl-6- (methylcarbamoyl) phenyl] -3 {[5- (trifluoromethyl) -1Htetrazol-1-yl] methyl} -1H-pyrazol-5-carboxamide; (B-27.31 (85%) + B-27.32 (15%)).Una composición activa que comprende (A) al menos un derivado de fórmula (I) en la que T representa un átomo de oxígeno y X se selecciona de la lista de 2-isopropilo, 2-ciclopropilo, 2-tercbutilo, 5-cloro-2-etilo, 5-cloro-2-isopropilo, 2-etil-5-fluoro, 5-fluoro-2-isopropilo, 2-ciclopropil-5-fluoro, 2-fluoro-6- isopropilo, 2-etil-5-metilo, 2-isopropil-5-metilo, 2-ciclopropil-5-metilo, 2-terc-butil-5-metilo, 5-cloro-2-(trifluorometil), 5-metil-2-(trifluoro-metil), 2-cloro-6-(trifluorometil), 3-cloro-2-fluoro-6-(trifluorometil) y 2-etil-4,5-dimetil, o una sal aceptable agroquímic