99% of powdery mildew cases I've seen are caused by a lack or no ventillation. Have good air movement - leaves should be trembling a bit.
redfox30 Reviewed by redfox30 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