Novel N-[2-(1,2-dichlorovinyloxy)phenylsulfonyl]-(thio)ureas of the general formula I ##STR1## in which X is oxygen or sulfur, R.sub.1 is hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.2 -C.sub.6 -alkenyl or C.sub.2 -C.sub.6 -alkinyl; and R.sub.2 is hydrogen, C.sub.1 -C.sub.12 -alkyl, C.sub.2 -C.sub.6 -alkenyl, C.sub.2 -C.sub.6 -alkinyl or C.sub.1 -C.sub.6 -alkoxy; and the salts of these compounds are described.These compounds have pronounced bactericidal properties and can be used without problems against bacteria which damage plants, especially in the agricultural sector.