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Last Updated: April 22, 2008
Your phlox could be showing signs of powdery mildew, aster yellows, or spider mites. It is impossible to tell from your description. You should contact your local Extension office and inquire about their plant diagnositic services.
Here is a link to the University of Minnesota's brief Tall Garden Phlox for Minnesota that provides care information and disease and insect damage descriptions. There also is a listing of recommended varieties.
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