The present invention provides a compound represented by formula (I) (in the formula, R1, R2, R3 and R4 each represent a hydrogen atom, a C1-6 alkyl group or the like, R1 and R2 may bond to form a 5- to 6-membered ring together with the carbon atoms bonded with R1 and R2, Q represents an organic group represented by formula (II) or the like (in formula (II), Ar1 represents a C6-10 aryl group or the like, Ra represents a hydrogen atom, a C1-6 alkyl group or the like, ＊ represents the bonding position of the organic group represented by formula (II))) or salt thereof, and also provides a fungicide for agricultural and horticultural use, a harmful organism control agent, and an insecticide or acaricide including at least one selected from the group consisting of the compound represented by formula (I) and salt thereof as an active ingredient.本發明提供一種式(I)(式中，R1、R2、R3、及R4分別獨立地表示氫原子、C1~6烷基等；R1與R2亦可一併與R1及R2所鍵結之碳原子共同形成5~6員環；Q表示式(II)(式中，Ar1表示C6~10芳基等；Ra表示氫原子、C1~6烷基等；＊表示式(II)所表示之有機基之鍵結位置)等所表示之有機基)所表示之化合物或其鹽、及含有選自由該化合物及其鹽所組成之群中之至少一者作為有效成分之農園藝用殺菌劑、有害生物防除劑或者殺蟲或殺蟎劑。
