Pyrido[2,3-d]pyridazin-5-one and pyrido[2,3-d]pyridazin-5-thione derivatives of general formula (I): STR1 wherein R and R1 independently represent hydrogen, optionally halogenated alkyl, alkenyl or alkynyl, optionally substituted heterocycle or a group --[CR41 R42 ]n -(phenyl)-(R3)q ; R2 represents halogen, optionally halogenated alkyl, alkenyl or alkynyl, CN; --CO2 R4 ; --S(O)r R4 ; --NO2 ; --NR41 R42 ; --OH; --COR4, --S(O)r R5, --CO2 R5, --OR5 ; --CONR41 R42, --OSO2 R5, --OSO2 R6, --OCH2 R5, --N(R41)COR6, --N(R41)SO2 R5, --N(R41)SO2 R6, --SO2 NR41 R42, optionally substituted phenyl, alkoxy or haloalkoxy; X represents oxygen or sulphur; R3 represents halogen, optionally halogenated alkyl, alkenyl, alkoxy, alkynyl, --OH, --S(O)r R4, --CO2 R4, COR4, --CN, --NO2, --NR41 R42, --OR5 ; --CONR41 R42, --OSO2 R5, --OSO2 R6, --OCH2 R5, --N(R41)COR6, --N(R41)SO2 R5, --N(R41)SO2 R6 or --SO2 NR41 R42 ; R4 represents a hydrogen atom or optionally halogenated C1-6 alkyl; R41 and R42, which may be the same or different, each represents a hydrogen atom or optionally halogenated C1-4 alkyl; R5 represents a phenyl group optionally substituted by from one to five groups selected from halogen, nitro, cyano, R4 and --OR4 ; m represents zero or an integer from one to three; n represents zero, one or two; where n is two, the groups --(CR41 R42)-- may be the same or different; q represents zero or an integer from one to five; r represents zero, one or two; with the proviso that when m represents zero R and R1 do not simultaneously represent hydrogen; and agriculturally acceptable salts thereof are useful as herbicides.
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