Ants present on the leaves and stems. There are several types of fungus that can be found on different trees. Small brown or green bugs on new growth in spring, some with wings, some without. These can form different powdery, crusty, or mossy looking growths on stems and trunks of trees. For some trees, leaf spot and anthracnose can mean a few dots on leaves here and there. The greenish-gray spots are lichen (part algae/part fungus) which live on trees, but only use them for support. There are different reasons some trees may acquire these growths and others don't. My Japanese Maple of 15 year is loosing its trunk bark. The main signs are rot on the truck of the tree, which can mess up its structural integrity. Japanese maple tree diseases come in two main forms: blight and fungal infections. The green spots on the trunk have no impact on the health of the tree. The area is firm to touch, and the bark is hard. I have put chicken wire around it for now to protect it … Your tree will not re-sprout. The inside of the tree at the base is fully exposed. Other symptoms of fungal infection include sunken areas on parts of the tree's bark and discoloration on the bark. 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. 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. Mulch should only be 1-2" deep around the tree and the root flare should always be visible. Aphids are sucking insects that feed on new growth and leave behind a sticky secretion. Older growth has a sticky sap-like residue on the leaves. I noticed it for the last couple of years. Or if the spots are more free-form, that could be anthracnose, another common leaf disease. Verticillum Wilt can be confirmed by sending samples of your tree to the New Haven Agricultural Station. Hi Bob­-The green growth on your trees could be algae, lichens, or moss. It's a fungus that kills Japanese Maples. Cause: Aphids. Hello, I have a red, bloodgood ,Japanese maple tree that is about 15 years old, and 14 ft. in height. They don't take any nutrients or energy from 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. maple, cottony camellia, oleander, and cottony taxus scale. Any advise would be GREATLY appreciated. There is a swelling around it’s trunk, about a foot above ground, with some small vertical cracks in the bark in this region. 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 … Annual light pruning is preferred to maintain tree size, shape and health. 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