Use of strobilurin type compounds for combating phytopathogenic fungi containing an amino acid substitution f129l in the mitochondrial cytochrome b protein conferring resistance to qo inhibitors vi

A compound of formula I

• wherein
• R1 is selected from 0 and NH;
• R2 is selected from CH and N;
• R3 is selected from halogen, CN, C1-C4-alkyl, C2-C4-alkenyl, C2-C4-alkynyl, C1-C4-haloalkyl, C2-C4-haloalkenyl, C2-C4-haloalkynyl, C3-C6-cycloalkyl, —O—C1-C4-alkyl, —O—C1-C4-haloalkyl, —O—C3-C6-cycloalkyl, —C1-C2-alkyl-C3-C6-cycloalkyl, phenyl, 3- to 6-membered heterocycloalkyl and 5- or 6-membered heteroaryl,
• wherein said heterocycloalkyl and heteroaryl besides carbon atoms contain 1, 2 or 3 heteroatoms selected from N, O and S provided that such heterocycloalkyl and heteroaryl cannot contain 2 contiguous atoms selected from O and S,
• wherein said phenyl, heterocycloalkyl and heteroaryl are bound directly or via an oxygen atom or via a C1-C2-alkylene linker, and wherein said phenyl and heteroaryl are unsubstituted or substituted by 1, 2 or 3 identical or different substituents selected from halogen, CN, NH2, NO2, C1-C4-alkyl, C1-C4-haloalkyl, —O—C1-C4-alkyl and —O—C1-C4-haloalkyl;
• R4 and R5, together with the three interjacent carbon atoms, form a partially unsaturated 5- to 6-membered carbo- or heterocycle,
• wherein the heterocycle includes beside carbon atoms 1, 2 or 3 heteroatoms independently selected from N, O and S as ring member atoms provided that such heterocycle cannot contain 2 contiguous atoms selected from O and S;
• and wherein the carbo- or heterocycle is unsubstituted or carries 1, 2 or up to the maximum possible number of identical or different groups R45;
• wherein
• R45 is selected from halogen, CN, C1-C4-alkyl, C1-C4-haloalkyl, phenyl, C3-C6-cycloalkyl and —C1-C2-alkyl-C3-C6-cycloalkyl;
• wherein it is possible that two R45 substituents which are bound to the same carbon atom or to two adjacent carbon atoms form a saturated 3- to 5-membered carbocycle;
• and wherein the cyclic moieties of R45 are unsubstituted or carry 1, 2 or 3 identical or different groups R45b:
• R45b is selected from halogen, CN, NH2, NO2, C1-C4-alkyl, C1-C4-haloalkyl, —O—C1-C4-alkyl and —O—C1-C4-haloalkyl;
• Ra is selected from halogen, CN, —NR5R6, C1-C4-alkyl, C2-C4-alkenyl, C2-C4-alkynyl, —O—C1-C4-alkyl, —C(═N—O—C1-C4-alkyl)-C1-C4-alkyl, —C(═O)—C1-C4-alkyl, —O—CH2—C(═N—O—C1-C4-alkyl)-C1-C4-alkyl, C3-C6-cycloalkyl, C3-C6-cycloalkenyl, —C1-C2-alkyl-C3-C6-cycloalkyl, —O—C3-C6-cycloalkyl, phenyl, 3- to 6-membered heterocycloalkyl, 3- to 6-membered heterocycloalkenyl and 5- or 6-membered heteroaryl,
• wherein said heterocycloalkyl, heterocycloalkenyl and heteroaryl besides carbon atoms contain 1, 2 or 3 heteroatoms selected from N, O and S provided that such heterocycloalkyl, heterocycloalkenyl and heteroaryl cannot contain 2 contiguous atoms selected from O and S,
• wherein said phenyl, heterocycloalkyl, heterocycloalkenyl and heteroaryl are bound directly or via an oxygen atom or via a C1-C2-alkylene linker, and wherein the aliphatic and cyclic moieties of Ra are unsubstituted or carry 1, 2, 3, 4 or up to the maximum number of identical or different groups Rb:
• Rb is selected from halogen, CN, NH2, NO2, C1-C4-alkyl, C1-C4-haloalkyl, —O—C1-C4-alkyl and —O—C1-C4-haloalkyl;
• R5, R6 are independently of each other selected from the group consisting of H, C1-C6-alkyl, C1-C6-haloalkyl and C2-C4-alkynyl;
• n is an integer selected from 0, 1, 2, 3 and 4;
• and in form of stereoisomers and tautomers thereof, and the N-oxides and the agriculturally acceptable salts thereof.