Heterocyclylpyri(mi)dinylpyrazole of the formula (I)in which R1 to R5, X1, U, Q, W, Y, n, a, b 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.式(I)雜環吡(嘧)啶基吡唑其中R1至R5、X1、U、Q、W、Y、n、a、b具有發明說明中所給予的意義,及農業化學活性鹽類,彼等用於控制植物上及/或中或植物之種子上及/或中的植物病原有害及產生黴菌毒素的真菌及用於減少植物或植物之部分中的黴菌毒素之方法和組成物,製備該等化合物及組成物及處理種子之方法以及彼等用於控制農業、園藝、林業、畜牧業、材料保護、家庭及衛生領域之植物病原有害真菌及用於減少植物或植物之部分中的黴菌毒素之用途。
