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im in the desert and have seen it snow overnight a few times at 15-30%rh. what i do to kill the spores now is fill a spray bottle with ro. adjust the ph to 9-10, and then add 200-300ppms protekt. i spray every 5 days lightly but thoroughly after raising the lights a couple feet with a fan...

the only time i have this problem is like stated above a tight collar on the stem, when res temps go above 70f, or if i tried a new rooting supplement containing organic kelp, stuff like that.