PROBLEM TO BE SOLVED: To provide a novel bactericide for agricultural and horticultural use, a novel pest control agent, and a novel insecticidal or miticide.SOLUTION: This invention relates to a compound represented by formula (I-1), or a tautomer thereof or salt. This invention also relates to a bactericide for agricultural and horticultural use, a pest control agent, and an insecticidal or a miticide containing at least one selected from the compound and the like as an active ingredient (Ris H, a C1-6 alkyl group or the like； Aris a C6-10 aryl group, a 3-6 membered heterocyclyl group or the like； A is a C1-6 alkylene group, a C2-6 alkenylene group or the like； Ris H, a C1-6 alkyl group, a C6-10 aryl group, an acetyl group or the like； Arand Rmay be connected together to form a 5-6 membered ring with a carbon atom to which Arand Rare bonded).SELECTED DRAWING: None【課題】新規農園芸用殺菌剤、有害生物防除剤、および殺虫または殺ダニ剤の提供。【解決手段】式（Ｉ－１）で表される化合物、又はその互変異性体若しくは塩。前記化合物等から選ばれる少なくとも１つを有効成分に含有する農園芸用殺菌剤、有害生物防除剤、及び殺虫又は殺ダニ剤。（Ｒ4はＨ、Ｃ１～６アルキル基等；Ａｒ1は等Ｃ６～１０アリール基、Ｃ３～６員ヘテロシクリル基等；ＡはＣ１～６アルキレン基、Ｃ２～６アルケニレン基等；ＲaはＨ、Ｃ１～６アルキル基、Ｃ６～１０アリール基、アセチル基等；Ａｒ1とＲaは相互に繋がって、Ａｒ1とＲaが結合する炭素原子とともに５～６員環を形成してもよい）【選択図】なし
