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Apr 3, 2024 · For a Japanese maple currently carrying cankers, prune away infected branches several inches behind the symptomatic tissue. Be sure to dispose of them promptly, and only make your cuts in dry weather with sharp, sterile blades. To address cankers on the trunk, you should consult an arborist or plant pathologist. 3.
- Alternaria Leaf Spot. Fungi in the Alternaria genus cause dark brown to black spots on the foliage. These spots may or may not have yellow halos. If the leaves are heavily infected, they will drop from the tree.
- Anthracnose. Anthracnose occurs in hundreds of species, including varieties of Acer. Symptoms can range from a few angular spots to complete defoliation.
- Bacterial Leaf Spot. If you grow fruit trees, lilacs, forsythia, or dogwoods, you might already be familiar with this disease. It’s a bacterial infection that enters through wounds on the plant, whether caused by insects, pruning, or wind damage, and it causes small black spots to appear on the leaves.
- Phyllosticta. This disease appears as round yellow or tan spots on the leaves. On other Acer species, the spots might also have a purple border. If you look closely, the centers might be so thin as to be transparent, and these might fall out, leaving small holes throughout the foliage.
Jan 29, 2024 · By staying vigilant and taking proactive measures, you can protect your tree from common problems such as aphids, scale insects, powdery mildew, and verticillium wilt. Regular care and maintenance, along with proper watering and fertilization, will help ensure the long-term health and vitality of your beloved Japanese maple tree.
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- Anthracnose
- Leaf Scorch
- Powdery Mildew
- Root Rot
- Verticillium Wilt
- Japanese Maple Disease Chart
Anthracnose in Japanese maples is caused by several fungal pathogens such as Aureobasidium and Colletotrichum. In most cases, this disease is only cosmetic and does not negatively affect the health of the plant. In extreme infections, defoliation and shoot dieback may occur, notably in spring right after the Japanese maple leafs out. Initial spring...
Leaf scorch is a physiological disease of Japanese maples. It is not caused by any pathogens; rather, it is due to a lack of water. Leaf scorch is more likely to occur during hot, dry periods. Trees planted in full sun are more often affected. Leaf scorch is almost never harmful to healthy Japanese maples, and the trees will recover nicely with pro...
Many genera of fungi cause powdery mildew on Japanese maples, namely Phyllactiniaand Sawadaea. Powdery mildew spreads by wind and does not need water to infect plants. This disease overwinters on plant debris in the soil. The spread of powdery mildew is favored by mild temperatures and relatively high humidity at night. Infection usually occurs in ...
Root rot in Japanese maples is usually caused by the oomycetes Phytophthora or Pythium. These fungus-like pathogens thrive in overly wet conditions caused by poor drainage, flooding, or excessive irrigation. The first symptoms of root rot in Japanese maples resemble physiological conditions, such as nutrient deficiencies or watering issues. Slowed ...
Verticillium wilt is a soil-borne fungal pathogen of Japanese maples and many other woody plants. This disease blocks the vascular system of Japanese maples, interrupting or preventing the flow of water. Severity varies based on where the Verticilliumfungus has colonized. When the newer wood is affected, the onset of symptoms is more sudden and qui...
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11. Improper Pruning. Improper pruning can stress the tree and lead to leaf curling. This is often due to cutting too close to the trunk or pruning at the wrong time of year. Solution: Prune your Japanese maple during the late fall or winter when the tree is dormant. Always make clean cuts, and avoid leaving stubs.
Luckily, most Japanese maple diseases can be prevented or managed with proper care and maintenance. Call 703-573-3029. Request a quote online! Verticillium Wilt. Verticillium wilt is caused by a soil-borne fungus that enters the roots of the plant and blocks the flow of water and nutrients.
Japanese maple is a spectacular, aristocratic tree suitable for most landscapes. As its name implies, Japanese maple is native to Japan, China and Korea. It was cultivated by the Japanese long before it was introduced into England and the United States in the early 1800’s. It can be used as a medium size specimen tree, an accent plant, bonsai ...
