стовбурова гниль

Stem birch rot

Birch is a deciduous tree that is widely used in landscaping. It is unpretentious, well withstands heat and cold. But weakened birches can be affected and stem rot occurs.

White marble rot of the trunk (Photo: George Chernilevsky) is caused by the fungus Fomes fomentarius – a true coppice.
One of the most common truffles. Cosmopolitan. The fungus infects weakened trees, and the fruiting body is formed on a dying tree.

Infection with the fungus occurs unnoticed. Fungal spores penetrate through the damaged bark, where they begin to develop. Initially, the leaves turn silver, which is caused by poisoning by toxins released by the fungus in the course of its life. Then on a birch trunk, in places of bark defeat it is possible to see red caps of mushrooms. If these hats are visible in several places, it will be difficult to save the tree.

If marble rot has affected a young tree, its lifespan is greatly reduced. Under adverse conditions, the affected young birch dies in 3-4 years.

In addition to birch, the truffle fungus affects oak, beech, alder, aspen, willow, ash and linden trees.


Brown cracked trunk rot (Photo: George Chernilevsky) is caused by the fungus Fomitopsis pinicola – bordered codling moth. Bordered coppice grows on felled trees, stumps of most deciduous trees, including birch and conifers. Weakened living trees can also be affected. Fruiting bodies on living trees usually grow in the lower part of the tree.

The fungus infects growing trees by penetrating them through broken knots and various wounds that have been caused by mechanical damage. Due to the fungus, wood rot begins at the periphery, then quickly spreads to the core. The initial stage of decay is characterized by the appearance of pink and reddish-brown color. Then longitudinal or oval white stripes with brown lines are formed in the wood. The cracks are filled with white mycelium, the wood acquires a strong fungal odor. The entire surface around the fruiting body is covered with white spores.

Fomitopsis pinicola affects birch, oak, ash, pine, spruce, fir, larch.

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Yellow-brown rot of the trunk (Photo: Roberto Zanon) is caused by the fungus Piptoporus betulinus – birch coppice. The fungus causes a mixed yellow-brown cracked rot of birch trunk. Growing trees are very rarely affected, parasitizing on weakened trees for various reasons. The lesion occurs through wounds. The mycelium develops first in the bark and sapwood, then penetrates to the center of the trunk. In the initial stages of rot, the wood becomes reddish and then yellow-brown. Gradually cracks form on the wood, it becomes rotten and easily ground into powder. Fruiting bodies appear in late summer, so it is difficult to detect damage to the tree.


Light yellow rot of the trunk (Photo: George Chernilevsky) is caused by the fungus Phellinus igniarius – a false truffle. The causative agent of rot develops only in the core of the trunk, so you can detect rot in trees that grow only on fruiting bodies. The beginning of wood rot is accompanied by the formation of longitudinal white spots and stripes, which then increase in size and cause the destruction of wood. At the final stage of decay, a light yellow rot with a large number of thin black lines is formed.

The pathogen Phellinus igniarius affects trees of all classes, ages, and with increasing age of plantations, fungal damage increases. The rot spreads in the shore at the bottom of the trunk, its length is up to 9 m.

When on the living, at first glance, the shore appear truffles, it means that it is already living its last days. Therefore, it is necessary to periodically inspect their trees for signs of stem rot before the formation of fruiting bodies of fungi.

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