fungicidal composition, mixed fungicidal composition, methods for controlling harmful fungi, plant diseases, protecting crop plants and improving crop yield and acid amide derivative

摘要

fungicidal composition containing acid amide derivative. Many fungicidal compositions have presented practical problems as either a preventive effect or a curing effect becomes inadequate, the residual effect tends to be inadequate, or the control effect against plant diseases tends to be inappropriate depending on the site of application, and a fungicidal composition to overcome these problems has been desired. The present invention provides a fungicidal composition containing an acid amide derivative of the formula (I) or a salt thereof as an active ingredient: wherein a is phenyl which may be substituted, benzyl which may be substituted, naphthyl which may be substituted. substituted, substituted heterocyclic ring, substituted fused heterocyclic ring, or the like; b is substitutable heterocyclic ring, substitutable fused heterocyclic ring, or substitutable naphthyl; each of r ^ 1 ^ and r ^ 2 ^, which are independent of each other, is alkyl or the like; R3 is hydrogen or the like; each of w ^ 1 ^ and w ^ 2 ^, which are independent of each other, is oxygen or sulfur.