Conventional fungicidal compositions have had practical problems such that either a preventive effect or a curative effect is inadequate, the residual effect tends to be inadequate, or the controlling effect against plant diseases tends to be inadequate depending upon the application site, and a fungicidal composition to overcome such problems has been desired. The present invention provides a fungicidal composition containing a carboxylic acid amide derivative of the formula (I) or a salt thereof, as an active ingredient: wherein A is phenyl which may be substituted, benzodioxolanyl which may be substituted, or benzodioxanyl which may be substituted B is 2- or 3-pyridyl which may be substituted each of R1 and R2 is alkyl, or R1 and R2 may together form a 3- to 6-membered saturated carbon ring, provided that when B is 3-pyridyl which may be substituted, A is phenyl substituted by at least two substituents.傳統殺真菌性組成物有實用上的問題,預防效果或治療效果無法勝任,殘餘效果有無法勝任的傾向,或防治植物病害效果有無法勝任的傾向(視施藥的位置而定),以及克服該問題之殺真菌性組成物業是所欲。本發明提供一種殺真菌性組成物,其含有如式(I)所示之羧醯胺衍生物或其鹽作為活性成份:其中A為可被取代的苯基、可被取代的苯并二噁茂烷基、或可被取代的苯并二噁烷基;B為可被取代的2-或3-吡啶基;R1與R2各自為烷基,或R1與R2可一起形成3至6員飽和碳環,但是當B為可被取代的3-吡啶基時,A為被至少二個取代基取代的苯基。
