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Oct 7, 2023 · Phyllosticta leaf spot: Brown spots on the leaves. Spray the leaves with triazole fungicide. Phytophthora Root Rot: Browning of the leaves. Plant Japanese maple only in well-drained soil. Tar spot: Black spots on the leaves. Spray the leaves with a multi-purpose fungicide.
- 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.
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.
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.
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.
Mar 1, 2024 · Do you know the common diseases of the Japanese maple? Find out which are the usual ones and what to do if you have an affected specimen.
