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Thread: Black spots on maple leaves

  1. #1
    Join Date
    Mar 2008
    Location
    Canaan NH
    Posts
    373

    Default Black spots on maple leaves

    I've got a maple tree down by the water by our pond with dark dry blotches at the edges of the leaves. Looking up, it is all over the tree. This is a relatively stressed out tree that has lost two limbs over the last few years due to weaknesses from a broken-off top. We have lived here for nearly 10 years and have never noticed these dark splotches on its leaves before--- I think it is new this year.

    A quick web search suggests it might be Maple Anthracnose: https://ag.umass.edu/landscape/fact-...le-anthracnose

    Is anyone else seeing this on their trees, or have you experienced similar markings on your trees in the past? What was the outcome?

    I don't tap this tree, but want to keep it as long as I can because it makes some nice shade down by the water.

    20210610_174641_HDR.jpg
    Boulder Trail Sugaring
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  2. #2
    Join Date
    Mar 2012
    Location
    Walpole, NH
    Posts
    1,363

    Default

    I have a few trees here that have it. I took pictures of a leaf and sent it to a NH State Forester and he confirmed that it is maple leaf anthracnose. He linked the sam Umass article as a good reference source.
    AF8C2412-15D1-42D1-B482-EC3BBC780E2C.jpg
    Sugaring for 45+ years
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  3. #3
    Join Date
    Jan 2013
    Location
    Bridgewater NH
    Posts
    176

    Default

    0CDDC718-D608-4258-8F23-8AACFA96F393.jpg
    Here is a leaf from a sapling right on the edge of my small pond
    D874CF4A-107E-43D5-BB00-B9289463B546.jpg
    This one is on a much dryer sight a few hundred feet away. Sugars don’t seem to have any spots at all
    Mike

    12 x 16 Sugar house
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  4. #4
    Join Date
    May 2009
    Location
    UVM Proctor Maple Research Center, Underhill Ctr, VT
    Posts
    6,391

    Default

    Maple anthracnose is mostly an aesthetic problem, rarely a cause for major concern. Tends to happen more in wet springs or in areas with a lot of dew that don't dry quickly. If it is on a lawn tree, rake the leaves in the fall and burn them or dispose of them off-site. That will remove many of the spores.

    https://ag.umass.edu/landscape/fact-...le-anthracnose
    Dr. Tim Perkins
    UVM Proctor Maple Research Ctr
    http://www.uvm.edu/~pmrc
    https://mapleresearch.org
    Timothy.Perkins@uvm.edu

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