Thank you for your prompt and accurate reply. We do have a cedar tree nearby and the yellowing leaves on the apple trees have the same markings as the ones shown in the photos on the Clemson site. I will speak with our local nurseryman about the best course of action. Is there a natural product/fungicide that you know of or have used for this problem?
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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.