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Old August 3, 2013   #2
greene
Tomatovillian™
 
Join Date: Jul 2013
Location: Savannah, Georgia
Posts: 13
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Here is a link to one site which says the powdery mildew specific to lilacs Microsphaera penicullata differs from the one on roses:

http://gardeninginthemud.wordpress.c...ldew-on-lilac/

On another site they recommend a dilute milk spray to eliminate the powdery mildew; it's worth a try before you cut down the beautiful lilac - which is my favorite flower!
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