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I’m doing it. 30 min today was a bit to much for my little monster crop clones. Temps are in the 80s here. Will only do 20 min tomorrow. I gotta do more research before I drag my big flowering girls outside. I WILL kill this powdery mildew.
Direct sunlight will not kill powdery mildew. Several plants not cannabis I have outside have PM that are in direct sunlight every day.
Sorry buddy but PM is a nasty son of bitch to get rid of. Best to either finish your flowering with PM or throw in the towel. You will need to sterilize your grow room if you don't want PM in your next crop.