hXXp://www.mandalaseeds.com/Guides/Marijuana-Mildew

pm can be avoided by using a castings tea and sprayed onto your vegging plants. i use it on my roses., works great. the theory is the microbes/bacteria on the leaf surface make for a unhospitable environment for mold spores. whatever the science it does work. youtube has good diy tea tutorials.

I keep plenty fresh air moving around on my Girls when Im growing,,and have never had a problem with PM,,except when I was curing and forgot to open and burp a jar i had misplaced. LOL