Microbiocidal quinoline dihydro-(thiazine)oxazine derivatives

A compound of formula (I):

• wherein:
• X is O or S or S(═O);
• R1 is halogen, methyl or cyano;
• R2 is hydrogen or halogen;
• R3 and R4 are each independently hydrogen or methyl;
• R5 and R6 are each independently selected from hydrogen, C1-C5alkyl, C1-C5haloalkyl, cyanoC1-C5alkyl, C1-C3alkoxyC1-C5alkyl, C2-C5alkenyl, C2-C5haloalkenyl, cyanoC2-C5alkenyl, C1-C3alkoxyC2-C5alkenyl, C2-C5alkynyl, C2-C5haloalkynyl, cyanoC2-C5alkynyl, C1-C3alkoxyC2-C5alkynyl and C3-C6cycloalkyl, wherein cycloalkyl is optionally substituted with 1, 2 or 3 substituents independently selected from halogen, cyano, C1-C3alkyl and C1-C3alkoxy;
• or
• R5 and R6 together with the carbon atom to which they are attached represent C3-C6cycloalkyl, wherein the cycloalkyl group is optionally substituted with 1, 2 or 3 substituents independently selected from halogen, cyano and C1-C3alkyl;
• R7 is hydrogen, C1-C4alkyl or C3-C4cycloalkyl;
• A is:
• (i) heteroaryl, wherein the heteroaryl moiety is a 5- or 6-membered aromatic ring which comprises 1, 2, 3 or 4 heteroatoms individually selected from N, O and S,
• (ii) heterobiaryl, wherein the heterobiaryl moiety is a 9- or 10-membered fused aromatic ring system which comprises 1, 2, 3 or 4 heteroatoms individually selected from N, O and S,
• (iii) heterocyclyl, wherein the heterocyclyl moiety is a 4- to 6-membered non-aromatic ring which comprises 1, 2 or 3 heteroatoms individually selected from N, O and S, or
• (iv) heterobicyclyl, wherein the heterobicyclyl moiety is a 7- to 10-membered fused or spirocyclic non-aromatic ring system which comprises 1, 2 or 3 heteroatoms individually selected from N, O and S,
• wherein heteroaryl, heterobiaryl, heterocyclyl and heterobicyclyl are each optionally substituted with 1, 2 or 3 substituents independently selected from R8, and/or for a heterocyclyl or heterobicyclyl moiety the ring may comprise an S(O)2 or a C═S group;
• and
• R8 is halogen, nitro, cyano, C1-C5alkyl, C1-C3haloalkyl, C3-C6cycloalkyl, C1-C5alkoxy, C3-C5alkenyloxy, C3-C5alkynyloxy or C1-C5alkylthio;
• or
• an agronomically acceptable salt, an N-oxide and/or S-oxide or a stereoisomer thereof.