If the leaves of the hornbeam turn whitish or have spots, powdery mildew is usually responsible. The spores of the harmful fungus particularly affect younger trees or hornbeam hedges.
How do you treat mildew on hornbeams?
Mildew on hornbeams occurs in dry summers (powdery mildew) or after cool, rainy springs (downy mildew). Affected areas should be cut out generously, leaves removed and plant parts disposed of in household waste. If necessary, a broad spectrum fungicide can be applied.
When does powdery mildew appear on hornbeams?
There are two types of 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. Pick up the fallen leaves. Dispose of all plant parts in the household waste and then clean all garden tools and your hands carefully.
Tip
There are a variety of fungi that cause 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.
