Oxime ether derivative and fungicide for agricultural and horticultural use

An oxime ether derivative represented by the following formula (I), or a salt thereof:

• wherein, X represents a halogen atom, C1-20 alkyl group, C1-20 alkoxy group, C1-20 haloalkyl group or C1-20 haloalkoxy group,
• R1 and R2 each independently represent a hydrogen atom, halogen atom, C1-20 alkyl group, C1-20 haloalkyl group, optionally substituted C3-10 cycloalkyl group, or R1 and R2 may bond together to form a ring,
• R3 represents a hydrogen atom, C1-20 alkyl group, C2-20 alkenyl group, C2-20 alkynyl group, C1-20 haloalkyl group, C2-20 haloalkenyl group, C2-20 haloalkynyl group or optionally substituted C3-10 cycloalkyl group;
• R4 represents a hydrogen atom, C1-20 alkyl group, optionally substituted C3-10 cycloalkyl group, C2-20 alkenyl group, C2-20 alkynyl group, C1-20 haloalkyl group, C2-20 haloalkenyl group, C2-20 haloalkynyl group, cyano group, nitro group or optionally substituted amino group,
• R5 represents a hydrogen atom, C1-20 alkyl group, acyl group, formyl group, C1-20 alkoxy-C1-20 alkyl group, C2-20 acyloxy-C1-20 alkyl group, C1-20 alkoxycarbonyl group, C1-20 alkylsulfonyl group or optionally substituted phenylsulfonyl group,
• Y represents an oxygen atom or sulfur atom,
• Z represents a single bond, oxygen atom, sulfur atom or NR6 (wherein, R6 represents a hydrogen atom or C1-30 alkyl group),
• Het represents an optionally substituted heterocyclic group,
• m represents an integer of 1 to 8, and R1 and R2 may be the same or different in the case m is 2 or more, and
• n represents an integer of 0 to 4, and X may be the same or different in the case n is 2 or more.