Canker (Nectria galligena):
Fungi that leads to the breaking off of bark. Affected twigs and
branches should be removed and burned. If the trunk is affected,
then an expert should be called to remove canker.
Diseases Norway Maple
Crown Gall disease (Agrobacterium tumefaciens):
Growths caused by bacteria. The tree should be evaluated.
Powdery mildew (Uncinula bicornis):
Grayish white covering that can be wiped off with a finger. Treatment
is not necessary. In extreme cases, dispose of the foliage in the
Leaf spots (Didymosporina aceris):
First small black spots on the leaves. Later, larger brown spots
until the leaves fall off. Treatment is not necessary.
Verticillium - wilt (Verticillium alboatrum):
Tracheomykose (vascular parasite mykosis) are wide spread in soils
used for gardening. The fungi enters through the roots and plugs
the vessels (brown coloration). This leads to the wilting of the
leaves. It is also possible that only parts of the tree are affected.
An exact diagnosis should be done by an expert because the symptoms
can also be have other causes (root damage, dryness, etc.).
Leaf deformation caused by gall mites. This is not dangerous for
Classification Norway Maple
Height: 20 -30 m
Leaf: alternate, pointed, 5 - 7 lobed, green
Flowers: April, yellow umbelgrapes, fragrant
Fruit: winged nuts, obtuse-angled in pairs
Branches: light brown, shiny, buds reddish brown
Bark: dark, elongated grooves
Root: shallow to heart-shaped roots
Habitat: sun to half-shade, brown edges on leaves point to a lack
Soil: sandy to loamy
ph-value: slightly acidic to basic