Vuilleminia

The fungus leads a saprotrophic and weakly parasitic lifestyle, penetrating the plant tissues through bark damage, cracks, or pruning wounds.

The fungal mycelium develops directly within the phloem and cambium, gradually spreading around the circumference of branches or the trunk.

During its life cycle, the pathogen causes structural changes in tissues, hindering normal sap flow and nutrient transport within the tree.

The development cycle of the fungus is closely linked to climatic factors that allow spores to spread actively and germinate on weakened wood surfaces.

The main symptom of the infection is the characteristic cracking and peeling of the bark, under which the fungal fruiting bodies are formed.

The fruiting bodies appear as thin, flat, crust-like structures tightly adhering to the wood, often having a grayish or creamy hue.

In areas where the fungus develops, the bark often dies off, exposing the wood, which leads to the gradual drying out of entire branches.

Infected areas eventually acquire a specific appearance, resembling «drying patches» that progressively encompass the entire circumference of the branch.

The affected branch or trunk stops receiving nutrients, causing premature leaf fall and the death of the entire canopy above the infection site.

The fungus is favored by high air humidity and moderately warm temperatures, typical of the autumn and spring seasons.

The pathogen is most active in dense plantings where natural air circulation is restricted and moisture tends to stagnate.

Weakened trees, suffering from environmental stress or poor maintenance, become easy targets for Vuilleminia spores.

The presence of fresh mechanical damage, frost cracks, or sunburns provides ideal entry points for the infection.

The spread of spores occurs through air currents, making it impossible to fully isolate a site from the presence of the pathogen.

Vuilleminia poses a serious threat as it causes localized tissue necrosis, leading to the death of skeletal branches and potentially the entire tree.

The disease significantly reduces the aesthetic value of landscape plantings and the productivity of orchards, rendering the wood unsuitable for use.

The gradual spread of the fungus along the trunk leads to a loss of structural integrity, increasing the risk of the tree falling during strong winds.

The dying bark opens the door for secondary pests, such as bark beetles and wood-boring insects, accelerating the plant's destruction.

Mass infestation of a garden by Vuilleminia may necessitate the complete removal and disposal of trees, resulting in significant economic losses.

The key control measure is sanitary pruning, which involves the complete removal of infected branches, including a portion of healthy tissue.

All cut surfaces must be treated with wound paint or antiseptic pastes to prevent re-infection.

Prevention includes maintaining optimal cultivation practices: timely fertilization, proper irrigation, and protection of trees from winter frost cracks.

Regular cleaning of the bark to remove lichens and dead tissues is recommended, as these can serve as shelters for pathogenic organisms.

• Thinning the canopy to improve air circulation.
• Disinfecting pruning tools after working on infected trees.
• Destroying contaminated plant debris by burning.