What Are Red Blobs On Maple Leaves?
Red blobs on maple leaves are often a sign of a fungal infection known as tar spot. Tar spot is caused by the fungus Rhytisma acerinum, which primarily affects maple trees, especially the Norway maple (Acer platanoides) and the silver maple (Acer saccharinum). The red blobs, or spots, are actually fungal structures called ascomata. They […]
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