A process for immunizing healthy plants against plant diseases which process comprises the dressing and/or coating of seeds or the treatment of plants and/or their environment by using active ingredients of the formula ##STR1## in which Hal is halogen, X is oxygen or sulfur, and R is hydrogen, C.sub.1 -C.sub.6 -alkyl, C.sub.1 -C.sub.6 -alkyl which interrupted by an oxygen or sulfur atom, C.sub.1 -C.sub.6 -alkyl which is substituted by halogen, cyano or the COO--C.sub.1 -C.sub.6 -alkyl radical, C.sub.3 -C.sub.5 -alkenyl which is unsubstituted or substituted by halogen, C.sub.3 -C.sub.5 -alkynyl which is unsubstituted or substituted by halogen, C.sub.3 -C.sub.6 -cycloalkyl which is unsubstituted or substituted by halogen or methyl, or a normal equivalent of a cation which is formed from a base or a basic compound.
一种用于对健康植物进行免疫防治植物疾病的方法,该方法包括通过使用以下式的活性成分来处理和/或包覆种子或处理植物和/或它们的环境:
其中Hal是卤素,X是氧或
硫,R是氢,C.sub.1 -C.sub.6 -烷基,C.sub.1 -C.sub.6 -烷基,被氧或
硫原子中断,C.sub.1 -C.sub.6 -烷基,被卤素、
氰基或COO--C.sub.1 -C.sub.6 -烷基基团取代,未取代或被卤素取代的C.sub.3 -C.sub.5 -烯烃基,未取代或被卤素取代的C.sub.3 -C.sub.5 -
炔烃基,未取代或被卤素或甲基取代的C.sub.3 -C.sub.6 -环烷基,或者是由碱或碱性化合物形成的阳离子的正常当量。