I had a mojor problem with Powdery Mildew last summer. I lost more than a pound of great bud to this problem. I went on a daily search for almost three months to find out how others have dealt with it.(both MMJ and tomato,rose and other normal gardeners)

First I found all of the recommendations that have showed up on this forum and others regarding Neem oil, Skim Milk, Serenade, Greencure and others. All of these solutions were applied after the fact once the grower discovered he had a problem. Of these the most effective seemed to be Fungaflor used by large scale indoor growers of all plant types.(based on my research not my actual use)

I am now convinced that the policy I will use from now on is to avoid the growroom conditions that make it easy for PM to take hold in the first place. Growroom humidity seems to be a major culprit here. Putting in more fans without addressing the overall humidty level will just give you more circulation of air that has too much humidity. Exchanging growroom air by intake of low humidity air while allowing the higher humidity air to exit the growspace will go a long way to preventing PM in the first place. There are other methods to deal with high humidity but this seems to be the most effective and introduces a new air supply with more co2 than the exiting air.

The most severe problems seem to occur with the "sealed room" methodology which tends to keep humidity levels high and also leads to some form of co2 suplement being needed. I am not contesting any of the methods others have suggested as they all seem to work at least in limiting or controlling the problem somewhat and many are highly effective but I feel it may be best to prevent the start of the problem. In some areas you may have to dehumidify the incomeing air before it gets to the growspace.
Max Blast Reviewed by Max Blast on . Powdery Mildew prevention help. hey fellas, I need a recommendation for a powdery mildew cure or prevention. I need something that is ok to use in the beginning stages of flowering, buds arent that big but they are there and i dont want to hurt them. I bought some neem oil spray, but i just found someone on a forum saying that neem oil is not good to use on flowering plants. Is this really true, particularly for the early stage? I'd really appreciate if someone can chime in with some experience. Need to figure this Rating: 5