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Here are some pictures of my lilacs in 2012. After I washed them down with baking soda water and it came back - it was NOT in any specific pattern nor did it necessarily go back in the same spots. As you can see, it just "grows" wherever it chooses. In the summer, it gets worse, continuing to...

I just found this older thread. I've had the same problem for at least 3 years on my lilacs and it is spreading to my holly bushes as well. I tried a guaranteed white powdery mildew treatment several times on the lilacs, and it had NO effect. I do NOT believe it is white powdery mildew. I'm in...