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Lilac tree
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white powder on my lilac tree now turning borown - what should I do?
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For more on marking an answer as the "Best Answer", please visit our FAQ.You probably have powdery mildew. You don't have to do anything, but this should help. Use any one of the first 3.
http://www.dirtdoctor.com/view_question.php?id=204
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