Hello SpicySativa,

Powdery mildew needs humid conditions to grow, so I'd crank up the dehumidifier, get a little fan action going and dry it that way. The lower the humidity the faster the dry time, so maybe that becomes a fast dry.

Bi-Carb Old Fashion fungicide is safe to use on vegtables, so it is pretty safe to use but I'm not sure I'd want to be spraying my smokeables/vapeables so close to harvest.

Since PM is a fungi that is spred by spores it is usually easy to get rid of once and for all. You did not say if you are growing indoors or out....if indoors you need to clean every bit of your grow/flower area with a mild bleach solution. Then control your humidity levels in the future. If outdoors you need to figure out where the spores are coming from; dead or old mj plants around, or an mj plant you planted that was infected or feral hemp (ditch weed). Because PM is pretty much order/family specific your spores are from some form of cannabis.

Good luck with the problem, hope you either find the source or get cleaning for the future.
OM
oldmac Reviewed by oldmac on . Harvest/dry/cure - Battling powdery mildew Hey everyone. I've got some plants that have 2, 3, and 4 weeks left of flowering (Space Queen, Jack the Ripper, then White Widow). I've been battling a very minor case of powdery mildew using a potassium bicarbonate spray (Bi-Carb Old fashioned fungicide). It's been working ok just with a weekly spray (other than the pistil damage). None has showed up on any of the buds or sugar leaves, just a couple shaded fan leaves here and there. I plan to do one last spray of bi-carb a couple days before Rating: 5