Redthorn: detecting and controlling diseases and pests

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Rotdorn is in itself a rather robust plant that is rarely attacked. However, there are some diseases and pests that can affect the plant.

Redthorn: detecting and controlling diseases and pests

As a robust and well adapted to our climate plant, the hawthorn is rarely affected by diseases and pests. However, it is not completely ruled out that the plant starts to ache. If you react quickly, there are usually no adverse effects on the plants. We want to describe the most common diseases and pests here in more detail. Learn how to identify and properly target an infestation and what really helps against diseases and pests.

The most common diseases and pests at a glance

  • fungal infection
  • fire blight
  • aphid
  • Gespinstmotte

fungal infection

Rot fungus fungal diseases are usually harmless and affect only the appearance, but not the health of the plant. Especially in warm and humid summers occurs fungal attack heaped up.

How can a fungal infection be detected?

The infested plants are characterized by a black coloration of the leaves. The leaves dry up and eventually fall off.

What should I do?

They do not have to be active in case of an infestation. Eliminate the old foliage, then you will soon be able to watch as the redthorn expands again.

fire blight

Fire blight is the most dangerous disease that can be observed on the hawthorn. First, fire blight can be confused with a harmless fungal attack, because even here, a brown to black color of the leaves occurs. The leaves do not fall off however. As a dangerous bacterial disease, fire blight attacks, in addition to hawthorn and hawthorn, and fruit trees and various other ornamental shrubs. Coniferous or berry fruits, on the other hand, are resistant to fire blight.

How can I detect fire blight?

As already mentioned, the leaves turn brown or black. But it does not come to the leaf fall. The leaves look like they are burned. Increasingly, hook-shaped deformations also show up at the shoot tips. Typical of fire blight are occurring in the summer and autumn and caused by the bacteria mucus droplets on the plant.

The course of the disease depends on the age of the plant. While young plants die off within a few weeks, older plants can live with the disease for several years.

What should I do?

Especially in humid weather in spring and in summer it comes to infestation with fire blight. Quick action is required because the disease spread like a bug and can be easily transmitted via garden tools, wind, insects or birds. In some areas there is even obligation to register for fire blight. Inquire therefore with the suspicion of the occurrence of the illness with the responsible offices.

Important: Infested plant material must not be allowed on the compost and, if possible, not in the bio-waste bin. Burning or disposing of the household waste is the better solution.

Most commonly, the plants infect themselves over the flower. If a regular check, first signs of illness can be noticed early. All affected shoots must then be cut back. It is essential to cut into the healthy wood.

In heavy infestation there is usually no rescue for the plant. Then you should remove the hawthorn immediately, so that the disease does not spread further. All cutting tools used must then be thoroughly disinfected with high-percentage alcohol.


Aphids have a firm grip on our plants, no wonder, because there are about 3,000 different species of voracious pests. In an infestation, the sap is sucked from the leaves. This is difficult to recognize at first. But those who control their plants regularly will not miss the pests visible to the naked eye.

How can aphids be detected?

If the leaves are sucked out, leaf discoloration and staining will occur at the one-stroke spots. A clear sign of aphid infestation are the so-called honeydew deposits. This sticky, sugary substance is the excreta of the aphid. Honeydew, on the other hand, provides mushrooms with a breeding ground. Thus, it is not uncommon that plants affected by aphids are additionally colonized by the soot dew.

What should I do?

You can fight aphids quite well without chemical means. It can already help if you shower the plant intensively with water. Also sprays with Horsetail (recipe for field horsetail), nettle (recipe for nettle) or garlic (recipe for garlic) have proven successful. In ladybugs, lacewing and parasitic wasp, the aphids have natural predators.


The caterpillars of the webbed moth prefer rotdorn leaves.Your appetite seems to know no limits and therefore it comes increasingly to Kahlfraß. Especially in late spring you can see more and more bare shrubs and trees, which shimmer silvery and offer a bizarre picture.

How can the spider moth be recognized?

Spider moths are colored light gray and have a black dotting. It is also characteristic of the pest that he has no hair. The caterpillars leave a fine veil to protect themselves from their natural predators.

What should I do?

The webs can be cut out of the plants over a large area. It is also possible to collect the caterpillars. A vigorous shower can also help to expel the caterpillars from the hawthorn. Kahlfraß occurs, there is no cause for concern, because the Rotdorn will drive out again for the Johannistrieb on 26 June.

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