Tree diseases correctly quickly recognize tree assessment from the professional

Tree disease | Tree assessment | Evaluation

Tree diseases correctly& detect quickly – tree assessment by a professional

You want to recognize and treat tree diseases correctly? We from tree are your experts for the assessment of tree diseases. We are on site throughout Germany, Austria and Switzerland to examine and evaluate your trees. Whether disease, deadwood or fungal infestation – early treatment of emerging symptoms on the tree is extremely important in order to sustainably protect the tree from damage or even death. Our tree disease experts carry out visual inspections, take samples and analyze them. After identification of the disease, we will give you a recommendation of measures for professional treatment and improvement of soil conditions. We will gladly implement the measures ourselves as part of tree care or provide you with a professional tree appraisal. In addition, we recommend regular tree inspections as a precaution against. In this way, emerging diseases and damage to the tree can be detected and treated at an early stage. Just contact us. Make an appointment for a tree assessment. You are also welcome to take advantage of a free initial consultation.

Quick and correct detection of tree diseases tree assessment by a professional

Tree diseases and their causes

Whether caused by age or by external factors such as weather, animals and vegetation, tree diseases can be caused by a variety of factors. However, while some symptoms such as tuber or green algae have no effect on tree vitality, other diseases can cause severe damage and death of the tree. Therefore, tree examination by a professional is often advisable to prevent damage. Here you will find an overview of the most common diseases. An assessment of the risk to your tree stand. However, in case of doubt, it is always advisable to consult a professional expert.

The most common tree diseases

Abiotic damage

Abiotic damage is caused by environmental influences such as hail, wind, frost, drought or the emission of pollutants. Common damage includes dried leaves, cracks in the bark, or broken branches. Secondary damage can also occur, reducing the tree's vitality and making it more susceptible to attack by parasites or fungi.

Leaf diseases

Leaf diseases occur in many different forms. From a whitish coating to browning of the leaves, a wide variety of symptoms can be observed, which can be caused by wetness or fungal attack. As a rule, leaf diseases are harmless. Do not require treatment.

Frost crack

frost cracks are caused by strong temperature changes from the inside of the trunk to the outside. Due to overflowing or. Self-closing of the wound, the tree forms vertical frost strips on the trunk. The same symptoms can also occur with sun cracks. The tree should be professionally examined if it has a frost or sun crack and is showing signs of vital weakness.

Resin flow

Resin flow occurs when the tree is injured as a natural defense reaction. The wound is closed and protected from rotting by the antiseptic properties of the resin. In some tree species, such as conifers, resin flow is considered a disease when there is a mass secretion of resin from the trunk surface.

Witch's broom

Witch's broom is also called thorn bushes and refers to spherical, bushy growths in the tree crown. Mostly birch trees. Firs affected. Witch's broom is caused by viruses, fungi or even hereditary bud mutations. They usually have no negative effects on the tree.


Tubercles are cell growths on the tree which, in the case of burl, result in grained wood. They are caused by bacteria, fungi, insects and other environmental factors. Nodules are usually located in the lower trunk area. Are not dangerous for the tree.

Weeping crack

If a black liquid oozes out of a crack in the trunk, this is called a weeping crack. While smaller cracks are not dangerous to the tree, larger cracks should be examined by a specialist as they indicate internal rot of the trunk. The tree can lose its vitality and die as a result.

Since woodpeckers prefer to build their nests in trees with decay, woodpecker holes can tell if a tree is most likely suffering from fungal attack. These trees should be examined by a professional.

Stem shoots

Shoots on the trunk are usually an indication that the tree is disturbed, especially if there is above-average growth and a high proportion of dead wood. These can be due to a variety of causes. Affected trees should be inspected by a specialist. Growths or even tree cancer are caused by infections of the bark. Of the wood caused by fungi or bacteria. The pathogen finds its way into the plant tie through smaller wounds in the bark, creating an open wound on the bark. This in turn leads to a strong formation of wound tie, as the wound is to be rolled over. However, because the infection is very aggressive, the tree is stimulated to form more callus, resulting in large growths. Depending on the depth of the wound, the affected areas may die as the water and nutrient supply to the branches above the wound may be cut off. In the case of growths and tree cankers, a specialist should always be consulted.

Fouling by other plants


If a tree is overgrown by ivy, vine or other plants, it does not harm it. Only when the infestation reaches such an extent that the assimilation of the tree is affected, the infestation should be removed.


Lichens are communities consisting of algae and fungi. Often tubular fungi close. Blue or green algae together. The fungus is responsible for the structure and color of the lichen. Lichens are extremely resistant to weather conditions such as cold or dry periods, but need light and moisture. Lichens are harmless to trees, but can be removed with brushes or special agents.

Green algae

Green algae, contrary to their name, cause an orange-red coloration on the bark of the tree. It occurs more frequently in warmer temperatures. Is often found on fruit trees. It is not dangerous for the tree itself.

Mistletoes are considered evergreen hemiparasites, as they grow exclusively on host trees. The seeds are carried to the trees by bird droppings. They draw water, and some species also draw nutrients, from the host. In case of heavy infestation, this can lead to the death of the tree, therefore a specialist should be consulted.


Fungi usually colonize trunks, stumps and branches of trees by penetrating the wood with their fungal filaments through resulting wounds. They extract nutrients such as cellulose from the tree in addition to water. Minerals, carbohydrates, fats and proteins are also taken from the healthy tree cells with the help of enzymes. Fungal infestation is usually only noticed when the fungus has already formed fruiting bodies. If it is a wood-destroying fungus species, the stability and breakage of the tree is endangered by attack of the wood. Death of the tree may occur. If a fungal infection is detected, the tree should be inspected by an expert.

Red pustules

The red pustule fungus is a wound parasite, which occurs in autumn and winter. The pustules appear on the bark of dead or injured branches and on sawn timber that has been lying on the ground for a long time. The fungus can spread from diseased to healthy wood, for example by entering through wounds. Infested tree tie should be immediately cut back to the healthy wood.

Damage by animals


If ants are more prevalent at the base of a tree and bore dust is leaking from the trunk itself, it can be amed that the tree has been damaged. Most likely, ants have built their nests in the cavity or rot of the trunk. Since the stability of the tree is at risk, it should be checked by a specialist.

Feed on leaves

Insects such as cockchafer or butterfly caterpillars can cause a large loss of leaf mass on the tree by feeding on leaves. As a rule, this does not harm the tree though. However, if there is severe leaf loss for several years in a row, this will affect its vitality. Aphids feed on plant sap. Can infest any tree species. They extract the phloem sap from the host plant and pollute it with sugary excretions, the so-called honeydew. This in turn attracts other insects, such as ants, which feed on the honeydew. In themselves, however, aphids are not a threat to the tree.


Galls are spherical growths on leaves, buds, shoots, flowers, or twigs and are caused by foreign organisms such as viruses, bacteria, fungi, mites, or insects. The majority of galls are caused by gall mites or gall wasps. Galls do not pose a threat to the tree.

Wood destroying insects

There are countless species of wood-destroying insects. Mostly these are wood-breeding insects. Bark and parts of the wood core are destroyed by the larvae, which in turn gives fungi the opportunity to invade the tree. If an infestation by wood-destroying insects occurs, an expert should be consulted in any case.


Mites primarily attack leaves and buds, which they destroy with their stinging and sucking apparatus. Needles and leaves of the host plant are sucked out, causing them to wither and die. The tree will be severely weakened as a result. Scale insects belong to the group of plant lice. Feed on plant sap. They mostly attack the bark and leaves, which leads to waterlogging. Due to the size of the aphids, an infestation is often only detected when they have developed shields through wax excretions. In case of very severe infestation, the affected tree should be examined by a specialist.

Tree diseases can be caused by a wide variety of triggers. While many of these are usually harmless to the tree, others can cause severe damage or even lead to the death of the tree. It is not always possible to clearly assign a tree disease to a cause, which is why it is always advisable to consult a specialist. This can identify the disease through a professional assessment. Implement appropriate measures for treatment. We of tree is your contact in Germany, Austria and Switzerland for tree inspections and the treatment of tree diseases – just contact us.

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