Fecha de publicación: -- Fuente: WIPO "tomato" The present invention relates to a stable synergistic insecticidal composition comprising A) a compound of Formula I, i. e., N- [2, 6 -bis ( 1 -methylethyl ) -4-phenoxyphenyl) -N ' - ( 1, 1- dimethylethyl) thiourea or its agrochemically acceptable salts, esters and derivatives; B) Isocycloseram or its agrochemically acceptable salts, isomers, esters, isomers and derivatives; and C) Pyriproxyfen or its agrochemically acceptable salts, isomers, esters or its derivatives for effective control of various insects-pests and wide range of diseases caused by them. The present invention also relates to a process for preparation of such insecticidal composition for synergistic and efficacious control of various insects such as sucking insect-pest, boring insect-pest, etc.