Abstract: [PROBLEMS] The present invention provides a novel alkoxyimino derivative or a salt thereof, as well as to a pest control agent containing the derivative or salt thereof as an active ingredient, which shows an excellent pest control effect on a wide range of pests in the agricultural and horticultural field and is also capable of controlling resistant pests. [MEANS FOR SOLVING PROBLEMS] The novel alkoxyimino derivative is characterized by being represented by general formula [I] (in the formula, X, R1, R2 and Q are as defined in the specification) and the post control agent is characterized by containing as an active ingredient the alkoxyimino derivative or a salt thereof.

Abstract: A 3,4-dihalogenoisothiazole derivative represented by the general formula [I] (wherein R1 is a halogen atom; A is an oxygen atom or a sulfur atom; and R is a C1-C6 alkyl group, a C2-C5 alkenyl group, a C2-C5 alkynyl group, a C3-C6 cycloalkyl group, a phenyl group or a 5- to 10-membered heterocyclic group containing at least one of oxygen atom, sulfur atom and nitrogen atom), or a salt thereof.

Abstract: A 1,2-benzoisothiazole derivative or a salt thereof is not harmful to a crop and is remarkably effective against agricultural or horticultural plant diseases such as Pyricularia oryzae, Septoria nodorum, Pseudoperonospora cubensis and Colletotrichum orbiculare, and an agricultural or horticultural plant disease-controlling agent containing the derivative or its salt as an active ingredient. The 1,2-benzoisothiazole derivative is represented by the general formula [I]: (wherein R1 is a hydrogen atom or a halogen atom, and R2 is a methyl group or a halogen atom), or a salt thereof.