Abstract: An object of the present invention is to provide an agricultural and horticultural composition excellent in the effect of controlling plant disease or accelerating plant growth and a method for controlling plant disease or accelerating plant growth. The agricultural and horticultural composition of the present invention contains t-butyl (6-{[(Z)-(1-methyl-1H-5-tetrazolyl)(phenyl)methylene]aminooxymethyl}-2-pyridyl)carbamate and a phosphite salt. A method for controlling plant disease or accelerating plant growth of the present invention comprises simultaneously or successively applying t-butyl (6-{[(Z)-(1-methyl-1H-5-tetrazolyl)(phenyl)methylene]aminooxymethyl}-2-pyridyl)carbamate and a phosphite salt such as potassium phosphite, ammonium phosphite, calcium phosphite, aluminum phosphite, or sodium phosphite to a plant, soil, or hydroponic plowland.

Abstract: A compound of formula (I) (in the formula (I), R1 represents a substituted or unsubstituted C1-6 alkyl group or the like, R2 represents a substituted or unsubstituted 5- or 6-membered heteroaryl group, R3 represents a substituted or unsubstituted C1-6 alkyl group, a substituted or unsubstituted C1-6 alkoxycarbonyl group or the like, Y represents an oxygen atom or NH, A1 represents a sulfur atom, an oxygen atom, or NR4, R4 represents a C1-6 alkyl group, A2 is a carbon atom or a nitrogen atom, X represents a substituent, n represents the chemically acceptable number of X, and is an integer of 0 to 3, and, when n is 2 or more, X may be identical to or different from each other), or a salt thereof is provided.

Abstract: A compound represented by a formula (II), an N-oxide compound, or a salt thereof: wherein R1 is a hydrogen atom, a substituted or unsubstituted C1-6 alkyl group, or a halogeno group; R2 is a substituted or unsubstituted 5- to 6-membered heteroaryl group; R3 is a substituted or unsubstituted C6-10 aryl group or a substituted or unsubstituted 5- to 10-membered heteroaryl group; Y is an oxygen atom, a nitrogen atom, or a sulfur atom; A1, A2, A3 and A4 are each independently a carbon atom or a nitrogen atom, provided that two or more of A1 to A4 do not represent nitrogen atoms at the same time; X is a substituent; n represents the number of chemically acceptable substituents represented by X, and is any one of integers of 0 to 5; and when n is 2 or more, the substituents X may be the same or different from each other.