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Black Spots on Maple Leaves – What’s Causing Them?

Black raised spots on Maple leaves are most commonly the result of a fungal disease known as Tar Spot (Rhytisma acerinum). The issue is largely cosmetic as Tar Spot doesn’t have a long-term effect on the trees’ health with affected leaves. Unfortunately, because fungal spores are carried on the wind, it is virtually impossible to …

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