Tar spot of maple

Tar spot is a very conspicuous fungal leaf spot disease of sycamore and some other maples. Whilst the large leaf spots sometimes cause gardeners concern, they actually do very little damage to the tree.

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Tar spot of maple

Quick facts

Common name Tar spot
Scientific name Rhytisma acerinum
Plants affected Acer species, particularly sycamore (A. pseudoplatanus)
Main symptoms Conspicuous raised, shiny, black leaf spots
Caused by Fungus
Timing Summer

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