The present invention provides a microbicide composition for plants, containing at least two active ingredient components in an amount producing synergistic activity, together with an appropriate filler, wherein component I is the compound 2-[.alpha.-{[(.alpha.-methyl-3-trifluoromethyl-benzyl)imino]-oxy}-o-tolyl]-yoxylic acid-methylester-O-methyloxime, and component II is a compound selected from the group consisting of benzo(1,2,3)thiadiazole-7-carbothio-acid-S-methylester ("Acibenzolar-S-methyl"); 3-anilino-5-methyl-5-(4-phenoxyphenyl)-1,3-oxazolidine-2,4-dione ("Famoxadone"); 4-(2,2-difluoro-1,3-benzodioxol-4-yl)pyrrole-3-carbonitrile ("Fludioxonil"); 4-(2,3-dichlorophenyl)pyrrole-3-carbonitrile ("Fenpiclonil"); 1 -methyl-cyclohexanecarboxylic acid-(2,3-dichloro-4-hydroxy-phenyl)-amide ("Fenhexamid"); 2-{2-[6-(2-cyano-phenoxy)-pyrimidin-4-yloxy]-phenyl}-3-methoxy-acrylic acid methyl ester ("Azoxystrobin"); Methoximino-(2-o-tolyloxymethyl-phenyl)-acetic acid methyl ester ("Kresoxim-methyl"); or respectively one of the salts or metal complexes of components I and II. The composition of the present invention finds use as a plant protection agent.