If the leaves of the hornbeam turn whitish or show spots, powdery mildew is usually responsible for this. The spores of the harmful fungus are particularly troublesome for younger trees or hornbeam hedges.
Areas affected by mildew should be removed as soon as possible
When does powdery mildew appear on hornbeams?
There are two types of powdery mildew: powdery mildew and downy mildew.
Powdery mildew occurs primarily in very dry summers, while downy mildew occurs after a cool, rainy spring.
Cut out affected areas generously. Gather the fallen leaves. Dispose of all plant parts in the household waste and then carefully clean all gardening tools and your hands.
tips
There are a variety of fungi that cause powdery mildew. Which harmful fungus it is in a specific case can only be clarified in the laboratory. If you use a fungicide, make sure it controls a wide range of fungi.