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- 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 · 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.
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Diseases of Japanese maples can cause spots on leaves, wilting, or even death. Luckily, most Japanese maple diseases can be prevented or managed with proper care and maintenance.
Sep 13, 2022 · Japanese maple trees look like a tasty treat to sucking and chewing insects. Learn which pests to watch for and how to control them at Gardener’s Path.
May 8, 2024 · Japanese maple trees can be susceptible to certain diseases and pests, such as tar spot, verticillium wilt, and aphids. Regularly inspect the leaves, branches, and stems for signs of distress if you want to catch (and stop) any issues.
Treating Anthracnose. Prune out any infected branches or shoots. Remove any fallen leaves or twigs from Japanese maples that have been previously infected with anthracnose, as the spores will overwinter in the dead material. Younger and stressed trees are more prone to infection and long-term damage.
Apr 3, 2024 · 1. Anthracnose. Fun fact about the word “anthracnose”: it’s a catch-all term for a group of related fungal diseases that usually cause darkened foliar lesions. And anthracnose can infect many plants, including Acer species such as Japanese maples.
