Some of the most important factors decreasing the life span of trees are pathogenic fungi causing wood decay. To protect old, monumental trees it is necessary to investigate a new methods of their conservancy. In this paper some results of the systemic fungicides applying to living trees were presented. Three applying methods were tested: to the ground, to the leaves and straight to the wood (using hydrostatic injections). The last method appeared as the most effective. Wood from trees protected with systemic fungicides by hydrostatic injections were decayed much slower by testing fungi in laboratory conditions. It was also proved that the fungicide applied in this way to the wood was transported both up and down in the stem, protecting all the tree. According to this results hydrostatic injections of systemic fungicides seem to be a new promising method of protecting trees against fungal wood decay.

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