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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.
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.
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- Leaves Curling. One of the first signs of distress in a Japanese maple is curling leaves. This is often a symptom of dehydration or lack of water, especially during hot, dry periods.
- Leaves Turning Brown. Browning leaves can be a common issue in Japanese maples. This is often caused by environmental stressors such as extreme temperatures, wind, and sun exposure.
- Leaf Scorch. Leaf scorch is often characterized by brown, dried-out patches on the leaves, which can give the tree a scorched appearance. Leaf scorch can be caused by a variety of factors, but it’s most commonly associated with environmental stressors.
- Slow Growth. Japanese maples are not known for rapid growth, but if your tree seems to be growing particularly slowly, it could be due to a few factors.
- 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.
Mar 29, 2021 · The most common Japanese maple diseases are caused by fungal infection. Canker can attack through bark damage. Sap oozes from the canker in the bark. A mild case of canker will resolve itself, but heavy infection will kill the tree. Verticillium wilt is another common Japanese maple disease.
- Jackie Rhoades
The most common diseases of Japanese maples are anthracnose, leaf scorch, powdery mildew, root rot, and Verticillium wilt. Prevention is the best line of defense for many of these conditions. Anthracnose in Japanese maples is caused by several fungal pathogens such as Aureobasidium and Colletotrichum.
May 8, 2024 · Disease and Pest Control. 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.
