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Apr 3, 2024 · 9 Common Japanese Maple Diseases. Anthracnose. Canker. Leaf Scorch. Phyllosticta Leaf Spot. Phytophthora Root Rot. Powdery Mildew. Pseudomonas Tip Blight. Tar Spot. Verticillium Wilt. If you’re in need of a refresher about how to grow Japanese maples, be sure to check out our guide. 1. Anthracnose.
- 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.
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Jan 29, 2024 · Japanese maple tree diseases and their management. The most commonly sees diseases on Japanese Maple trees are: Powdery Mildew. Verticillium Wilt. Anthracnose. Leaf Spot. Apart from powdery mildew and verticillium wilt, Japanese maple trees can be susceptible to other diseases such as anthracnose.
Sep 13, 2022 · Cottony maple scale ( Pulvinaria innumerabilis ), horse chestnut scale ( Pulvinaria regalis ), and Japanese maple scale ( Lopholeucaspis japonica) are three species of these common pests that you might find on your tree. Cottony maple scale. Photo by Megachile, Wikimedia Commons, Public Domain.
- 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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by Jamie. Japanese maples are a favored option for garden enthusiasts and landscape designers because of their striking foliage and graceful structure.
Japanese maples often suffer health issues that are environmental in nature, but they are also susceptible to some common diseases ( many of which are shared throughout the Acer genus). Diseases of Japanese maples can cause spots on leaves, wilting, or even death.
