It started in an area I set up for seedlings. It was too small a space with too little air movement.
That stuff if easy to get and hard to get rid of.
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@JoeCrowe swears by sulfer. He will tell you about it, just to hear the sound of his own voice. 
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hellz yah! Crystallize those plants in sulfur and the powdery mildew will be extinct. The specific protocol is drench the plants in veg once then 2 weeks later. powdery mildew is dead forever.
It’s a host specific exoparasite, which makes it really easy to kill.
Colorado state, accept no imitations.
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