I've been using Fungus Pharm. It actually sounds like Greencure, it's "organic" and safe for use on edibles.

I completely changed my growing environment, I just keep spraying the plants about every 3 days, with the added air circulation, and lowered humidity I haven't seen any PM at all for the last 6 days!
CesaroSumm Reviewed by CesaroSumm on . Powdery Mildew help! I've noticed some plants have a couple leaves with Powdery Mildew, I've noticed it for about 2 weeks now, but it has not gotten worse. One plant yellowed up quite a bit, however I'm not sure if this is from the Mildew, or if when I was transitioning from Veg to Flower if I neglected to add enough Nitrogen to the res. I'm starting to spray the leaves with a formula(Fungus Pharm, anyone used it?) that seems to be working fairly well. I've fixed all the problems causing the mildew to Rating: 5