Provided is a novel pesticide, particularly a fungicide and a nematicide. An alkynyl pyridine-substituted amide compound represented by formula (I), its N-oxide or a salt thereof, and a pesticide containing it. [In the formula, G 1 is a structure represented by G 1 -1a, G 1 -3a, G 1 -27a, etc. X 1 is a halogen atom, difluoromethyl, trifluoromethyl, etc. Y 1 is a halogen atom, etc. Y 2 , Y 3 , R 4 and R 5 independently represent a hydrogen atom, etc. R 1 is a hydrogen atom, a halogen atom, methyl, methoxy, etc. R 2 is a hydrogen atom, a halogen atom, etc., or R 1 and R 2 together form an alkylene chain thereby to form a cyclopropyl group together with the carbon atom to which R 1 and R 2 are bonded, or R 1 and R 2 together form C 1 -C 2 alkylidene or C 1 -C 2 haloalkylidene R 3 is a hydrogen atom, methyl, etc. and R 6 is C 1 -C 4 alkyl, C 3 -C 6 cycloalkyl, C 1 -C 4 alkoxy(C 1 -C 4 )alkyl, etc.]
