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Nov 28

On Japanese maples, cankers look tan or grey compared to the usual red color of healthy branches. Verticillium wilt is one of the most dangerous Japanese maple diseases. For some trees, leaf spot and anthracnose can mean a few dots on leaves here and there. Should I spray something on the fungus? Asked March 24, 2016, 8:45 PM EDT. Certain varieties of Japanese maple planted in wet, warm climates are prone to this fungus. A white fungus known as powdery mildew is one of several leaf diseases prone to attacking the brightly colored Japanese maple tree, Acer palmatum. It was planted about 5 years ago and seems to have a split in the bark on the trunk. When left untreated, anthracnose is fatal to Japanese maple trees. It is caused by a soil-dwelling fungus that is very difficult to eradicate. There are numerous reasons behind Japanese maple dieback, from girdling roots that compress the stem and sapwood to fungus that attacks from … The fungus attacks the tree through its roots, sometimes affecting one side of the tree while leaving the other intact. Hi, I have noticed the fungus in the attached photo growing on our Japanese Maple tree. Or if the spots are more free-form, that could be anthracnose, another common leaf disease. Verticillium wilt inhibits water flow while producing toxins. If you see circular, brown spots on Japanese maple tree leaves, it’s likely a leaf fungus called leaf spot. Shelf fungus on Japanese Maple. Cankers are dead areas that can grow until they encircle the trunk or branch and kill it. "Japanese maples may be troubled by anthracnose, powdery mildew, leaf spot, leaf scorch, root rot, aphids, scales and borers," according to the Clemson University Extension service.

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