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The fungus Rhytisma acerinum overwinters on fallen acer leaves, then infects the new spring foliage. The first signs are yellow leaf spots that turn into large shiny black blotches up to 1.5cm across. Severe cases can mean the leaves drop early
can damage their leaves.More acer projectsPlant acer and ajuga in a containerDeal with acer tar spotBrowse acer varietiesAdd autumn colour to your garden
, just as the new foliage emerges, as a preventative measure.shrubs, roses spring, summerCommon problems affecting trees and shrubsAcer tar spotLeaf miner flyReversionPowdery mildew
