The present invention relates to the use of a mixture, comprising as active compounds in synergistically effective amounts at least a fungicide (compound I) of the group of strobilurines and a further fungicide (compound II) of the group of dithiocarbamates for synergistically increasing the health of a silvicultural plant, in particular Eucalyptus. The invention further relates to a method for synergistically increasing the health of a silvicultural plant, comprising applying to silvicultural plant propagation material and/or applying to the locus where the silvicultural plant or plant seedling is growing or expected to grow and/or applying to the substrate in which the silvicultural plant or plant seedling is growing or expected to grow and/or applying to the silvicultural plant, or part of the silvicultural plant, preferably the leaves (foliar application), at any time during the vegetative and/or reproductive growth stage at least once a mixture comprising at least a fungicide (compound I) of the group of strobilurines and a further fungicide (compound II) of the group of dithiocarbamates, in particular pyraclostrobin and metiram.La présente invention concerne lutilisation dun mélange, comprenant comme composés actifs dans des quantités efficaces de façon synergique au moins un fongicide (composé I) du groupe des strobilurines et un autre fongicide (composé II) du groupe des dithiocarbamates pour augmenter de façon synergique la santé dune plante sylvicole, en particulier deucalyptus. Linvention concerne en outre un procédé pour augmenter de façon synergique la santé dune plante sylvicole, comprenant lapplication à la plante sylvicole dune matière de propagation et/ou lapplication sur le locus où la plante sylvicole ou le semis de plante croît ou où il est attendu quil croisse et/ou lapplication au substrat dans lequel la plante sylvicole ou le semis de plante croît ou où il est attendu quil croisse et/ou lapplication à la plante sylvicole, ou à une partie d
