1. Use of 1-cyclopropyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid derivatives of the formula (l) see diagramm : EP0121727,P34,F1 in which R**1 represents a CO-R**6, CN, SO2 -R**7 or S-R**8 radical, wherein R**6 represents hydrogen, optionally substituted straight-chain or branched alkyl with 1 to 6 carbon atoms, optionally substituted aryl with 6 or 10 carbon atoms, optionally substituted aralkyl with 6 carbon atoms in the aryl part and 1 to 3 carbon atoms in the alkyl part, optionally substituted alkoxy or alkylthio with 1 to 6 carbon atoms, optionally substituted phenoxy, optionally substituted benzyloxy, amino, optionally substituted alkylamino or dialkylamino with 1 to 6 carbon atoms per alkyl radical or optionally substituted phenylamino, R**7 represents optionally substituted straightchain or branched alkyl with 1 to 5 carbon atoms, phenyl or methylphenyl, R**8 represents methoxycarbonyl, trichloromethyl, trifluoromethyl or dichlorofluoromethyl, R**2, R**3, R**4 and R**5 can be identical or different and represent hydrogen, methyl, ethyl or n- or i-propyl and X represents hydrogen, halogen or nitro, and their acid addition, alkali metal and alkaline earth metal salts, zinc, manganese and copper salts and hydrates, for combating bacteria in plant protection.
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