This image provided by Bugwood.org shows powdery mildew symptoms on zinnia foliage. (Elizabeth Bush/Virginia Polytechnic Institute and State University/Bugwood.org via AP)
This image provided by Bugwood.org shows powdery mildew symptoms on zinnia plants. (Elizabeth Bush/Virginia Polytechnic Institute and State University/Bugwood.org via AP)
This image provided by Bugwood.org shows powdery mildew symptoms on a zinnia plant. (Elizabeth Bush/Virginia Polytechnic Institute and State University/Bugwood.org via AP)