Maple Bark Bursts - Causes and Measures
When the maple bursts the bark, immediate action is required. The tree is in danger, some of the pathogens endanger man.
Causes when the bark bursts
A harmless cause is stress. Often the bark bursts shortly after planting. The tree has grown in the nursery under optimal conditions. Moving is particularly stressful when lying in the sun after digging out.
The bark hardens. The danger of bursting is extremely great if, after planting, the side that was in the sun is in the shade.
Road salt, over-fertilization or a lack of water supply also stress the tree. The bark breaks on the trunk. Such wounds, such as wounds after a cut, are dangerous.
In the wounds penetrate fungal spores, which multiply under the bark. The infections are very damaging to the tree.
Recognition of maple infestation
The bark is bursting due to the fungi Nectria galligena and Cylindrocarpon mali. Branches and shoots that lie above the spot wither. Dying begins in damp and cool weather.
From the tree bark grow small spherical structures. If you raise the bark, you will find a white spore surface in the summer and orange pin-sized beads in the fall. The disease is known as fruit tree cancer, although it also attacks the maple frequently. The tree tries to cover the wound with bark.
The maple is also susceptible to the fungus Cryptostroma corticale, which causes the sootbug disease. Under the bark, a thick black mushroom grass forms. The tree usually dies and the bark bursts. In the early stages, the wood is discolored green or blue at the torn areas.
Attention: The spores trigger allergies and inflammation of the alveoli.
Treating Diseased Trees
Trees are usually not to be rescued when the symptoms mentioned are obvious are visible. Anyone who directly removes affected branches when the bark breaks and the first leaves fall off can sometimes save the maple. In the case of cancer, it has been proven to cut out the diseased wood and treat the bark with copper-containing agents.
If there is a black coating under the bark, you must not cut off any part of the tree, as there is a suspicion that it is is the sootbug disease. A tree expert must decide on further measures. There is a great danger that lay people will become infected by careless handling of the fungus.
Preventive measures against bark diseases
It has been shown that fungi live for years under the bark without proliferating or causing any damage , The diseases only break down when the tree is weakened.
In case of dryness, care must be taken to ensure adequate water supply. In addition, mineral fertilizers and road salt are to be avoided, these products damage the roots and hinder the absorption of water.
The use of copper-containing compounds is of concern as copper damages earthworms. As a rule, it is better to cut a diseased tree and replace it with a wood that is immune to the fungi.
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