A compound of formula (I):, where A is an ortho-substituted ring selected from a number of specified rings; R.sup.1 is halogen, cyano, nitro, C.sub.1-4 alkyl, C.sub.1-4 haloalkyl, C.sub.1-4 alkoxy or C.sub.1-4 haloalkoxy or optionally substituted C.sub.2-4 alkenyl, optionally substituted C.sub.2-4 alkynyl or optionally substituted SO2(C.sub.1-4 alkyl) (where the optionally substituted moieties may each have up to 3 substituents, each independently selected from halogen and C.sub.1-4 alkoxy); R.sup.2 is C.sub.1-4 alkyl, C.sub.1-4 haloalkyl, C.sub.1-4 alkoxy(C.sub.1-4)alkyl or C.sub.1-4 alkylthio(C.sub.1-4)alkyl or [optionally substituted aryl](C.sub.1-4)alkyl- or [optionally substituted aryl]oxy(C.sub.1-4)alkyl (where the optionally substituted aryl moieties may each have up to 3 substituents, each independently selected from halogen and C.sub.1-4 alkoxy); R.sup.3 is hydrogen, CH.sub.2C.ident.CR.sup.4, CH.sub.2CR.sup.4.dbd.C(H)R.sup.4, CH.dbd.C.dbd.CH.sub.2 or COR.sup.5 or optionally substituted C.sub.1-4 alkyl, optionally substituted C.sub.1-4 alkoxy or optionally substituted (C.sub.1-4)alkylC(.dbd.O)O (where the optionally substituted moieties may each have up to 3 substituents, each independently selected from halogen and C.sub.1-4 alkoxy, C.sub.1-4 alkyl, C.sub.1-2 haloalkoxy, hydroxy, cyano, carboxyl, methoxycarbonyl, ethoxycarbonyl, methylsulfonyl and ethylsulfonyl); each R.sup.4 is, independently, hydrogen, halogen, C.sub.1-4 alkyl, C.sub.1-4 haloalkyl, C.sub.1-4 alkoxy or C.sub.1-4 alkoxy(C.sub.1-4)alkyl; and R.sup.5 is hydrogen or optionally substituted C.sub.1-6 alkyl, optionally substituted C.sub.1-4 alkoxy, optionally substituted C.sub.1-4 alkoxy(C.sub.1-4)alkyl, optionally substituted C.sub.1-4 alkylthio(C.sub.1-4)alkyl or optionally substituted aryl (where the optionally substituted moieties may each have up to 3 substituents, each independently selected from halogen, C.sub.1-6 alkoxy, C.sub.1-6 haloalkoxy, cyano, hydroxy, methoxycarbonyl and ethoxycarbonyl). ##STR00001##