Content
- Common hawthorn diseases and their control
- The fire blight: Dangerous and notifiable
- Other diseases of the firethorn:
- scab
- grating
- mildew
- Tips & Tricks
Common hawthorn diseases and their control
Hawthorn, like many rose plants, is prone to fungal diseases. While plants that are affected by fire blight usually need to be removed, you can combat fungal diseases such as the mildew itself.
The fire blight: Dangerous and notifiable
Like the firethorn, the hawthorn is prone to fire blight. The pathogen is a bacterium that spreads epidemic-like under optimal growth conditions. The fire blight is transmitted primarily by the highly infectious bacterial mucus, contaminated cutting tools and infected plant material.
A fire blight infestation can be detected by the fact that the leaves and shoot tips of the hawthorn turn brown and dry out; they look like they're burned. Characteristic are the drooping shoot tips of the affected plant. In the further course of the disease occurs on branches and leaves of infectious bacterial mucus.
Discover fire blight on a hawthorn you must immediately report this to the State Office of Agriculture. The affected trees must be cleared in most cases. In the immediate vicinity, the keeping of bees is prohibited because the insects provide for a large spread of spores.
Other diseases of the firethorn:
scab
In this fungal disease, the hawthorn shows brownish spots and cracks on the leaves and fruits. To prevent it, do not plant the hawthorn shrubs too tightly so that water on the leaves can evaporate quickly. Cut diseased parts deep into healthy wood and dispose of the plant parts in the household waste.
grating
The causative agent of this plant disease hibernates on the juniper and infects the hawthorn each year. The branches of the hawthorn have orange-colored thickenings, in which the spore bearings of the fungus are. Orange-red spots appear on the top of the leaves, the leaf veins and petioles are thickened. Combat the plant disease with suitable fungicides.
mildew
Like all rose plants, the hawthorn is susceptible to mildew. In this plant disease, the leaves of the affected plant have white-gray, milky patches. As the disease progresses, the foliage rolls in and cripples the fresh hawthorn shoots.
In dry and warm weather with nocturnal dew formation, the entire plant can be covered in mildew in a very short time. The fungus spreads through spores and forms dark winter fruit bodies in the winter, which overwinter in the fallen leaves and fruits.
Remove all affected parts of the plant and dispose of them in the residual waste. Then treat the diseased plant with a suitable pesticide.
Tips & Tricks
Fungal spores also adhere to the garden tools, wooden posts, fences and mats for protection against the cold. Therefore clean all equipment after contact with the diseased plant thoroughly and disinfect it.