Rowan - detecting and controlling diseases and pests

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The rowan belongs to the resistant plant. However, care mistakes can be the cause of some diseases and pests. What these are and how you fight them, read here.

Rowan: detecting and controlling diseases and pests

With the mountain ash, you get a robust plant in your garden. The plants are very well adapted to the climatic conditions in our latitudes and are rarely affected by diseases or pests. However, this is favored by care mistakes of inexperienced hobby gardeners. If the demands of the plant are taken into consideration, probably your grandchildren will enjoy the rowanberry trees in their own garden.

Find out now which diseases and pests of mountain ash can be dangerous and how you can effectively counteract them.

Overview of diseases and pests of mountain ash

❍ Help, fire blight

If dark discolorations appear on the shoots and flowers, the cause is probably fire blight. This bacterial infection is easy to play when nursing errors creep in, for example, if the plant is too dark or casting errors happen. All affected parts of the plant should be removed immediately. It can be affected by flowers and shoots. The leaf veins are darkly discolored.

" Tip: The affected parts of plants are also removed in the fall, because they are not discarded and spread the disease on.

Fire blight must be treated with suitable protective agents. Use a broadband agent. So far, there are no explicit fire blight funds on the market.

Attention: Fire blight is notifiable!

❍ insects approaching

Some insects can make life difficult for the rowan and sometimes cause serious feeding damage to the leaves and shoots of the tree. In the unfavorable course, it comes to a complete Kahlfraß.

Priority should be given to the rowan fruit moth, which has it on the berries apart. Also, the hawthorn spinner and the small frost scraper can cause considerable damage, because the caterpillars are particularly voracious. The hawthorn beetle is particularly common in the Franconian area in appearance. The larvae are already working on the shoots. The beetles eat the remaining leaves. The rowanberry is quite often completely bleak in summer.

In the Thuringian Forest, the medium black weevil is growing. In the Ore Mountains, on the other hand, the cover-shield louse is increasingly becoming a danger. An infestation remains unrecognized for a long time. Usually the bark parenchymal suckers are only recognized when the tree already loses its bark. A strong infestation is usually no longer able to fight at this stage and the trees die off.

❍ Mushrooms as a threat to mountain ash

Tree fungi can also occur on the mountain ash. An infestation with Schwefelporling or tree sponge is clearly visible by the attentive hobby gardener and can be quickly remedied with suitable protection against fungal attack. The fungi begin to develop on the trunk and can there undetected considerable proportions.

If the fungal infection is not detected at an early stage, there is usually no rescue for the rowanberry. The spores spread unhindered on the trunk and can also attack surrounding plants.

Not only the trunk can be infested. The rust fungi attack the leaves. On the top of the leaves are red, yellow or brown discoloration. The undersides are covered with elongated spore leaves.

The rowan may also be affected by mildew. The leaves are then covered with a flour-like coating. Most of the tops of the leaves are affected. The disease is largely harmless. In severe infections, leaf fall can be the result.

❍ cancer patient rowan

Various diseases of the bark are commonly referred to as "ash cancer". In the process, the bark and the wood of the tree are rapidly changing. The process can take several years. Responsible are different types of mushrooms, especially the Hallimasch. The bacteria can penetrate through small openings in leaves or bark. The branches or trunk swell and burst in the further course. Over time open crater-like wounds are formed, which are blackish discolored.

" Tip: Regular checks should not be missed. Fungal attack requires immediate intervention and control by appropriate means.

❍ Withered shoots by gray horse

If the fresh shoots do not develop as usual, but wither and dry out, an infestation with gray mold probably occurred. Gray mold usually occurs in the rowan berry only due to care mistakes. Trees in isolation are rarely affected. Gray mold usually occurs in wet locations.An infestation can also occur if the plant is too crowded and does not receive enough air.

All affected shoots should be removed immediately, so that the gray horse can not continue around. The branches are to be cut directly on the trunk so the disease can not spread further.

Fight diseases and pests properly

Winter Moth

The Frostspanner has natural predators in the Great Tits. A nesting box on the rowanberry helps to destroy the caterpillars. Frost scrapers can also be removed with the help of glue rings, because the female animals are unable to fly.


So that the beetle can not spread, it is advisable already to fight the larvae. In the roundworm, the animals have a natural predator. These nematodes are commercially available and can easily be added to the irrigation water.

" Tip: Pour in the evening, sunlight kills the worms.


The best prevention is to prove flair while casting. Only use fertilizers with a low nitrogen content. Horsetail broth may be administered as a tonic. Affected plant parts are cut back.

" Tip: Gray mold-infested plant parts do not belong to the compost. The fungal spores were multiplying there.

Avoid diseases on the rowan by proper care

When cultivating mountain ash, be aware of the following points to avoid many of these diseases.

Frequent care mistakesexplanation
wrong locationSite selection is especially important. Older rowan should not be used anymore. The trees need a light and warm location. However, the rowanberry does not tolerate excessive heat. Therefore, do not plant the mountain ash near walls or walls that release the heat of the day to the plant. The trees do not want to feel pressed and should be planted in isolation if possible.
wrong casting behaviorThe rowan needs a lot of moisture. However, excessive watering can also be harmful. The trees do not tolerate waterlogging. In addition it comes increasingly, if the soil is not permeable enough and the irrigation water can not drain sufficiently, but accumulates in the soil.
unfavorable soil conditionsWith coarse sand or gravel, heavy soils can be loosened up and a drainage of gravel or potsherds is brought into the ground during planting, this also prevents waterlogging. Barren soils can be upgraded by mixing in compost. Fertilization with a special product for deciduous trees is also possible.

Video Board: How to get rid of fruit tree canker.

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