This is a question near and dear to my heart, as I think my unsprayed century-old apples trees manage to get every pest known to appledom. (I still make great sauce by cutting around the bad bits.) I wonder if you are referring to sooty blotch? I found a photo of it and other apple diseases, so start here: http://hgic.clemson.edu/factsheets/hgic2000.htm
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.