Fungal diseases are due to location and / or care errors
Most diseases or Infections in Japanese maple are due to incorrect care and / or an unsuitable location return. This type of maple is mainly for mildew as well as susceptible to the notorious Verticillium wilt. Powdery mildew is typical when the plant is not watered enough on hot summer days. Frequent watering of the leaves can also cause the disease, which is why the leaves should not be wetted when watering. The pathogens of the Verticillium wilt, in turn, come from the ground and penetrate from there into the ducts of the wood.
also read
- Japanese maple threatened by diseases such as verticillium wilt
- Ball trumpet tree is prone to Verticillium wilt
- Robust Japanese maple is not prone to disease
The causative agents of the wilt disease are verticillium fungi living in the soil, which mainly penetrate the wood and block the pathways there. As a result, the Japanese maple is no longer supplied with sufficient nutrients and water, so that it gradually dies. The first signs are drying leaves as well as shoots on previously healthy plants that seem to have died off for no reason.
What can you do about Verticillium wilt?
Unfortunately, there is no effective fungicide against Verticillium wilt. As the only rescue attempt, you can transplant or remove the affected Japanese maples. Dig up and put in a pot and also cut back generously. The clippings must never be placed on the compost, but should be removed with the household waste. You can also activate the resistance of the wood with herbal tonics.
What causes dried up and / or discolored leaves?
The so-called leaf tip drought occurs in Japanese maples especially when the location is too draughty or too draughty. is too windy. Otherwise, brown leaf spots in very exposed, sunny places indicate burns from the sun, while dry and / or discolored foliage is usually due to excessive drought or waterlogging is.
Common pests: mites and plant lice
Also pests like spinning and Gall mites, Aphids or scale insects are an indication that the Japanese maple is either not comfortable in its location or receives improper care.
Tips
A Transplanting the Japanese maple that has been planted should only be done if there is really no other way. Ornamental trees often react to root damage with fungal attack, especially with the Verticillium pathogen.