Disclosed is a fungicide composition in the form of a concentrated suspension including at least two active ingredients in the form of solid particles, at least one bark penetrating agent, the median diameter D50 of the solid particles being from 0.1 to 1 μm, the composition having a depth of penetration of at least one of the active ingredients into the wood, in particular the ligneous parts of at least 0.1 mm, its use for treating diseases of the wood, in particular of the ligneous parts of perennial plants and a method for treating perennial plants.
