INSECTICIDAL SUBSTITUTED ARYL PYRIDONES

A compound of formula (I) wherein R , R , R and R are independently selected from hydrogen, halogen, lower alkyl optionally substituted by halogen, lower alkoxy optionally substituted by halogen and lower alkenyl optionally substituted by halogen; R is halogen, amino, mono- or di(lower alkyl)-amino, lower alkyl substituted by halogen, lower alkoxy optionally substituted by halogen and lower alkenyl optionally substituted by halogen provided that R is not monochloro or monobromo-methyl; R is oxygen or sulphur; R and R are independently selected from hydrogen, halogen, lower alkyl optionally substituted by halogen, lower alkoxy optionally substituted by halogen, and lower thioalkoxy optionally substituted by halogen; and R is hydrogen, halogen, optionally substituted lower alkyl, optionally substituted lower alkoxy, optionally substituted lower thioalkoxy, cyano, nitro, optionally substituted oximino, optionally substituted lower alkenyl, optionally substituted aryloxy, optionally substituted amino or S(O)nR wherein n is 0, 1 or 2 and R is optionally substituted lower alkyl; R is hydrogen, or lower alkyl optionally substituted by halogen, lower alkenyl optionally substituted by halogen or C02R wherein R is lower alkyl optionally substituted by halogen; provided that R , R , R , R and R are not all hydrogen: and further provided that when R is trifluoromethyl and R and R are halogen, R and R are not both hydrogen, or R , R , R and R do not comprise from one to four halogen or trihalomethyl substitutents.