Many spots occur along the veins. Or if the spots are more free-form, that could be anthracnose, another common leaf disease. Hello, I have a red, bloodgood ,Japanese maple tree that is about 15 years old, and 14 ft. in height. Japanese maple tree diseases come in two main forms: blight and fungal infections. These can form different powdery, crusty, or mossy looking growths on stems and trunks of trees. Hi Bob­-The green growth on your trees could be algae, lichens, or moss. Cause: Aphids. Ants present on the leaves and stems. Colloidal silver is a water like medium with a concetration of silver ions in it and silver is and have always been a remedy for bacteria, fungus … Aphids are sucking insects that feed on new growth and leave behind a sticky secretion. They don't take any nutrients or energy from 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. I have put chicken wire around it for now to protect it … Other symptoms of fungal infection include sunken areas on parts of the tree's bark and discoloration on the bark. 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. The greenish-gray spots are lichen (part algae/part fungus) which live on trees, but only use them for support. Thin trees with rot are likely to fall apart. For some trees, leaf spot and anthracnose can mean a few dots on leaves here and there. I noticed it for the last couple of years. There are different reasons some trees may acquire these growths and others don't. 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. 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. The inside of the tree at the base is fully exposed. Verticillum Wilt can be confirmed by sending samples of your tree to the New Haven Agricultural Station. Proper pruning of Japanese maple is essential for tree health. It's a fungus that kills Japanese Maples. Annual light pruning is preferred to maintain tree size, shape and health. Areas often enlarge killing the entire leaf. Any advise would be GREATLY appreciated. 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. Well, anyway, since it works very well on fungus, virus and bacteria I thought it was worth a try to use it on my verticillium wilt infected japanese maple. The main signs are rot on the truck of the tree, which can mess up its structural integrity. 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