I've heard the Commercial greenhouses use sulfur vaporizers to deal with that and other mold/fungi and most insect pest(although the research I've done most say it will put a dent in spider mites, but won't run them completely out), but works well for thrips and white flies if you've got problems with them. I was reading one guys post on another forum site(he's from Seattle), and he said with the R/H there he's got to use a vaporizer once a week or he gets all kinds of things.
Agoblue97 Reviewed by Agoblue97 on . 911 I have my form filled out!!!PLEASE Ok, so I have white mildew towards the bottom and appears to be rising. What the hell is it? Please, I do not want to kill my grow:( What is your experience level? (first timer, ...) Your Equipment: .1) Type and wattage of lights. (400w MH with a couple cfls .2) Distance from tops? 18 inches .3) Reflector type? (, enclosed reflector, bare cfls...) .4) Is there a consistent fresh air supply? I thought so .5) Do you have an exhaust fan and a circulation fan? yes Rating: 5