Abstract: Synergistic fungicidal compositions are provided for use in the treatment or control of plant diseases caused by or associated with phytopathogenic fungi. The compositions comprise at least one conazole fungicide and at least one fungicidal compound which is a fungicidal volatile oil. The conazole fungicides are selected from imazalil, prochloraz, propiconazole, tebuconazole, epoxiconazole, flusilazole and metal complexes thereof. The fungicidal volatile oils are selected from fungicidal C6-C12 aldehydes, fungicidal C6-C12 alcohols, fungicidal C6-C12 carboxylic acids and fungicidal C6-C12 esters. The preferred conazole fungicides are imazalil, prochloraz and the preferred fungicidal volatile oil is n-hexanal.