N2-phenylamidine derivatives

A method of combating fungi at a locus infested or liable to be infested therewith, which comprises applying to the locus a compound of formula I or a salt thereof

• wherein
• R1 is hydrogen, optionally substituted alkyl, optionally substituted alkenyl, optionally substituted alkynyl, optionally substituted carbocyclyl and optionally substituted heterocyclyl;
• each of R2 and R3, which may be the same or different, is any group defined for R1, or together with the nitrogen to which they are attached form a ring, which may be substituted;
• R4 is selected from the group consisting of alkyl, alkenyl, alkynyl, carbocyclyl and heterocyclyl, each of which may be substituted;
• m is 1;
• R5 is any group defined for R4 attached to the 5-position of the benzene ring M;
• R6 is optionally substituted carbo- or heterocyclyl;
• and
• A is selected from the group consisting of a direct bond, —O—, —S—, —NR9—, —CHR7—, and —O—CHR7—;
• where R9 is selected from the group consisting of alkyl, alkenyl and alkynyl, each of which may be substituted by a member of the group consisting of alkoxy, haloalkoxy, alkylthio, halogen and optionally substituted phenyl;
• where R7 is selected from the group consisting of alkyl, alkenyl and alkynyl, which may be substituted by a member of the group consisting of alkoxy, haloalkoxy, alkylthio, halogen and phenyl optionally substituted by a member of the group consisting of alkyl, haloalkyl, alkoxy, haloalkoxy and alkylthio;
• where —A—R6 is in the 4-position of the benzene ring M and the moiety depicted on the right side of linkage A is attached to R6,
• or —A—R6 and R5 together with benzene ring M form an optionally substituted fused ring system.