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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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What causes white spots on Japanese maple leaves?
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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.
White spots on Japanese maple leaves could be caused by leaf spot, which is a common disease, Phyllosticta, powdery mildew, a fungal infection, scale, mealybugs, bird droppings, or unfavorable weather conditions such as late spring frost. Every one of those causes has a different set of symptoms and solutions.
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.
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.
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.
