Tip - Powdery Mildew: Fight It Before It Gets Your Plants! — The Gardenist

It's back! I just noticed the first spots on my fading peony plants. I was hoping that with the reduction of shade trees in my garden and with the increase in airflow through extensive pruning and reorganizing that I might have nipped my annual powdery mildew problem in the bud. I guess these preventative measure just weren't quite enough so it's time to up the ante before things get really out of control.