A composition for combatting fungal and bacterial diseases in plants is disclosed which contains, as the active ingredient, a compound of the formula: IMAGE in which: R1 is hydrogen or an alkyl radical containing from 1 to 6 carbon atoms, R2 is an alkyl radical containing from 1 to 18 carbon atoms, R1 and R2 can additionally form an ethylene or propylene chain which is optionally substituted by alkyls containing from 1 to 3 carbon atoms, and R3 and R4, which are identical or different, are hydrogen, an alkyl radical containing from 1 to 18 carbon atoms, a cycloalkyl radical containing from 3 to 7 carbon atoms, an alkenyl radical containing from 3 to 18 carbon atoms, the phenyl radical or the benzyl radical, in association with an inert carrier which is acceptable in agriculture.
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