NegotiatedBubblecommentedweek 112y ago
@Girl_Scout, a few more thing help fight powdery mildew:
Lowering the temps. Danger zone for Powdery Mildew is 62% - 93% RH and 77°- 87° (25°C - 30°C). For Botrytis (bud rot), it’s all about the RH, since it grows in low temps.
I have never tried it, but what about running a HEPA filter in the grow? Theoretically, these PM spores are floating around waiting to germinate on one of your plants. Why not catch them in a HEPA filter to reduce the count?
More of a long term solution, but various strains are bred for PM and disease resistance. Outdoor strains are of interest since one cannot control the conditions.
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