I actually use the great outdoors to help get plants healthy again, including plants that have powdery mildew. Typically I only have to treat fruiting bodies and eventually it just stops showing or progressing. I don't know how much of this has to do with my particular environment, conditions in my area, but that's how I've ended up doing things.
I'll give you this year's for instance; My White cut that came down with PM worse than any other cut after battling root aphids, and despite receiving the same treatment with
Eagle 20 that all other mothers did (and have shown no PM since Tx) she still expressed fruiting bodies of powdery mildew. I decided I wasn't going to continue to throw the same chemistry at her, and decided that she's going to either have to shit or get off the proverbial pot and either die or get through it. Well, it's been a few weeks, and rather rainy weeks at that, and damn if she doesn't look like she's over it. Or, at the very least, the PM has been suppressed.
It's while they're building buds that I worry, much more so than during vegetative phase.
