Heterocyclylpyri(mi)dinylpyrazole of the formula (I) in which R1 to R5, X1, U, Q, W, a, b and n have the meanings given in the description, and agrochemically active salts, to their use and to methods and compositions for controlling phytopathogenic harmful fungi in and/or on plants or in and/or on seed of plants and for reducing mycotoxins in plants and parts of the plants, to processes for preparing such compounds and compositions and treated seed and also to their use for controlling phytopathogenic harmful fungi in agriculture, horticulture, forestry, in animal husbandry, in the protection of materials, in the domestic and hygiene field and for the reduction of mycotoxins in plants and parts of the plants.本發明係關於式(I)之雜環基吡(嘧)啶基吡唑其中R1至R5、X1、U、Q、W、a、b及n具有在發明說明中提供的意義,及農業化學上活性的鹽類,及其用於控制植物病原性有害真菌及/或在植物或及/或在植物的種子及在植物及植物的部份用於減少黴菌毒素的用途及方法及組成物、用於製備此化合物及組成物及處理種子之方法,以及其在農業、園藝、森林用於控制植物病原性有害真菌、在畜牧業、在材料保護、在家庭及衛生領域及在植物及植物的部份用於減少黴菌毒素之用途。
