My Japanese Maple of 15 year is loosing its trunk bark. Other symptoms of fungal infection include sunken areas on parts of the tree's bark and discoloration on the bark. If you see circular, brown spots on Japanese maple tree leaves, it’s likely a leaf fungus called leaf spot. Japanese maple tree diseases come in two main forms: blight and fungal infections. Verticillum Wilt can be confirmed by sending samples of your tree to the New Haven Agricultural Station. Areas often enlarge killing the entire leaf. They don't take any nutrients or energy from the tree. I noticed it for the last couple of years. I have put chicken wire around it for now to protect it … Very common in spring when new growth is emerging. Hi Bob­-The green growth on your trees could be algae, lichens, or moss. It's a fungus that kills Japanese Maples. This is a much more serious disease that affects all kinds of maples, but Sugar Maple and Silver Maple are the ones most commonly affected. Proper pruning of Japanese maple is essential for tree health. The inside of the tree at the base is fully exposed. Older growth has a sticky sap-like residue on the leaves. Symptoms One of the first things you may spot if your Japanese maple has a disease problem is an outbreak of small, round, red or purple spots on the leaves of the tree. There is a swelling around it’s trunk, about a foot above ground, with some small vertical cracks in the bark in this region. Hello, I have a red, bloodgood ,Japanese maple tree that is about 15 years old, and 14 ft. in height. The greenish-gray spots are lichen (part algae/part fungus) which live on trees, but only use them for support. The green spots on the trunk have no impact on the health of the tree. Acer spp.. Anthracnose (fungus – Gloeosporium apocryptum): In rainy seasons this disease may be serious on silver maples and Japanese maples.Irregular, light to reddish-brown, or purplish-brown, dead areas occur on the leaves. Or if the spots are more free-form, that could be anthracnose, another common leaf disease. Aphids often feed on leaves producing honeydew that encourages the growth of black sooty mold fungus on other leaves or on surfaces beneath the tree. There are different reasons some trees may acquire these growths and others don't. Any advise would be GREATLY appreciated. Many spots occur along the veins. Your tree will not re-sprout. Annual light pruning is preferred to maintain tree size, shape and health. The main signs are rot on the truck of the tree, which can mess up its structural integrity. The area is firm to touch, and the bark is hard. There are several types of fungus that can be found on different trees. I am not sure what to do or why this is happening. Aphids are sucking insects that feed on new growth and leave behind a sticky secretion. Mulch should only be 1-2" deep around the tree and the root flare should always be visible. Ants present on the leaves and stems. 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