The present invention relates to combinations of hydroxypyrion compounds, and silver compound which provide an improved biocidal effect. More particularly, the present invention relates to compositions comprising a combination of a hydroxypyrion compound selected from 1 -hydroxy-2-pyridinone, ciclopirox, ciclopirox olamine, piroctone, piroctone olamine, rilopirox, or a salt thereof, together with one or more silver salts selected from silver acetate, silver alginate, silver azide, silver citrate, silver lactate, silver nitrate, silver perchlorate, silver sulfate, silver chloride, silver thiocyanate, silver-sodium-hydrogen-zirconium phosphate, silver sulfadiazine, silver cyclohexanediacetic acid and disilver 2,5-dichloro-3,6-dihydroxy-2,5-cyclohexadiene- 1,4-dione in respective proportions to provide a synergistic biocidal effect. Compositions comprising these combinations are useful for the protection of any living or non-living material, such as crops, plants, fruits, seeds, objects made of wood, thatch or the like, engineering material, biodegradable material and textiles against deterioration due to the action of microorganisms such as bacteria, fungi, yeasts, algae, virusses, and the like.La présente invention porte sur des combinaisons de composés dhydroxypyrion et dun composé de largent qui fournissent un effet biocide amélioré. Plus particulièrement, la présente invention porte sur des compositions comprenant une combinaison dun composé dhydroxypyrion choisi parmi la 1-hydroxy-2-pyridinone, le ciclopirox, le ciclopirox olamine, le piroctone, le piroctone olamine, le rilopirox ou un sel de ceux-ci, conjointement avec un ou plusieurs sels dargent choisis parmi lacétate dargent, lalginate dargent, lazoture dargent, le citrate dargent, le lactate dargent, le nitrate dargent, le perchlorate dargent, le sulfate dargent, le chlorure dargent, le thiocyanate dargent, le phosphate dargent-sodium-hydrogène-zirconium, la sulfadiazine dargent, lacide cyclohexanediacétique
