The German oak is probably the best-known and most important tree species in Germany. It not only grows in the forest, but is also more commonly planted in gardens and parks. Unfortunately, the German oak is susceptible to diseases and pests. What diseases can occur?
What diseases can occur in the German oak?
Harmful diseases for the German oak include powdery mildew, wilt, canker and fire fungus, which are caused by harmful fungi. Pests include oak gall wasps, oak moths and oak processionary moths. Prevention and appropriate control measures are important for the he alth of the tree.
German Oak Diseases
- Mildew
- Wilt
- Cancer
- Fire Sponge
All of these diseases are caused by harmful fungi. They can be so serious that the tree dies, even if it is a very old specimen. Due to increasing environmental pollution, oak trees are also at risk, meaning they do not cope well with pathogens.
Signs of illness vary greatly. Watch your oak tree carefully. As soon as the leaves curl and dry out or there are abnormalities on the trunk, you should get to the bottom of the cause of the changes. A white or gray coating indicates powdery mildew. Many oak trees in Germany are affected by this.
Measures to prevent disease
To prevent this, you must ensure that the German oak has ideal conditions. Oak trees need soil that is always slightly moist. Water the trees not only in hot summers, but also in very dry winters.
Provide sufficient nutrients. Fertilize the oak regularly, especially when it is still young and the roots do not reach deep enough into the soil.
It is beneficial to mulch the soil under a German oak tree. This prevents the soil from drying out and at the same time provides the tree with nutrients that are released through the decomposition of the mulch material.
Cut oak correctly
You should remove branches affected by diseases immediately. Saw them clean and smooth. Seal larger wounds with balm (€12.00 on Amazon) so that pathogens cannot penetrate the tree.
Do not leave fallen leaves from diseased trees lying around, but remove them completely from the garden.
What pests can occur?
- Oak gall wasps
- Oak moth
- Oak Processionary Moth
Pests usually appear on the leaves. Take appropriate measures to combat an infestation. However, most pests don't cause too much damage as long as the oak is otherwise he althy.
An exception is an infestation by the oak processionary moth. Since this pest is highly irritating to the skin, it should be removed by professionals.
Tip
The German oak is one of the most valuable native tree species. Over 200 species of insects, various types of beetles, butterflies as well as birds, squirrels and other mammals feed on the flowers and fruits.
