Some symptoms include wilted leaves, bark discoloration and rotting or sunken parts of the tree bark. 1. These sucking insects can include aphids and scale insects and sooty mold may occur on any tree but is most commonly seen on boxelder, elm, linden, and especially maple trees. can i treat the fungus. The most common maple tree diseases come from fungus that causes cankers on the bark. Nectria galligena can be identified by bark that looks like split and peeled paper. Your tree will not re-sprout. Fall color is yellow to golden brown. I *believe* it's a Bloodgood (pics in the 'Name that Plant' forum). my japanese black pine twin trunk. They don't take any nutrients or energy from the tree. Mulch should only be 1-2" deep around the tree and the root flare should always be visible. Japanese maple trees, when damaged, are susceptible to mold, fungus and boring insects. The pathogens are dark fungi growing either on the "honeydew" excreted by sucking insects or on exuded sap material coming from leaves of certain trees. On the other hand, black lesions at the base of branches, leaves or even the trunk tend to indicate an issue with the fungus Fusarium. The trees have deeply lobed, dark green leaves that turn crimson in autumn. The leaves of the tree do not look very healthy this year. When the maple tree in my yard was cut down because it was declining, the whole interior was eaten up by termites, ants, etc. Pink and black lesions are a sign of nectria cinnabarina. Protect the tree from excess moisture and bugs until the tree has time to heal. maple, cottony camellia, oleander, and cottony taxus scale. The underlying fungus is different for different species, but all these fungi cause the growth of a white mold on the tree's leaves and stems. Japanese maple trees can provide a striking focal point, be the perfect plant to set off a large container, or grow into an impressive bonsai specimen. At first the infected tissue is light green or yellow. The bark is usually redder in winter compared to the salmon color of its more famous cousin ‘Sango kaku’. I've been there, too. Eutypella looks similar to nectria galligena; however, it is thicker and more difficult to peel. It's a fungus that kills Japanese Maples. Maple Tree Tar Spot. The trees have small leaves not big like Norway maples and they do not appear to be very healthy. If you love Japanese maple varieties but live in a region where they won't survive the winter, try Korean maple. In addition, the wood under the peeling bark is covered with a mat of fungus. Proper pruning of Japanese maple is essential for tree health. ), a much smaller, weeping tree often used as a garden focal point. and its little brother, the Japanese laceleaf maple (Acer palmatum var. 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. Ben Kawa green leaf Japanese maple. Summer leaves are green, autumn leaves a glowing, deep red. 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. Then, during late summer, raised, shining black, tar-like dots develop within the yellow spots on the upper leaf surfaces. Verticillium wilt is another common Japanese maple Fungus on the Trunk of a Silver Maple. It looks like my small japanese cutleaf maple tree has a white fungus growing on the leaves. Name: Acer pseudosieboldiana On Japanese maples, cankers look tan or grey compared to the usual red color of healthy branches. You might want to look into this before winter, if … I have a Yezo nishiki that has scarring on the lower trunk right above the graft union. Small, brown fruiting structures of the fungus are found near the affected leaf veins. Caused By: Fungi that tends to hide in leaf debris.Specific species include Rhytisma acerinum, R. americanum, and R. a bit on root and a bit on trunk. Densely cloaked with crinkled green leaves. Identification: Black spots that range in size from a pin-prick to size of a half dollar (4 cm).Some reports say that the spots can get as big as two inches. Verticillium wilt inhibits water flow while producing toxins. My Japanese Maple of 15 year is loosing its trunk bark. The most common Japanese maple diseases are caused by fungal infection. They look great against a back drop of snow. The greenish-gray spots are lichen (part algae/part fungus) which live on trees, but only use them for support. If you see circular, brown spots on Japanese maple tree leaves, it’s likely a leaf fungus called leaf spot. The inside of the tree at the base is fully exposed. The leaves are still dropping. A white fungus known as powdery mildew is one of several leaf diseases prone to attacking the brightly colored Japanese maple tree, Acer palmatum. Any advise would be GREATLY appreciated. They recently said I had a fungus on my tree, so I looked at it and searched for info/pictures similar, but found nothing extraordinary on the web like this. I am not sure what to do or why this is happening. This type of maple tree loves full sun and partial shade. 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. Please, if anyone knows what it is or what to do or who to call regarding a white fungus growth all along the trunk of my red maple tree. 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