It looks like mold, but I dunno what kind exactly...After a thorough cleaning, I would try to do whatever I could to get the humidity in the room down to or below 30% and keep the temps around 70ish, multiple heaters and dehumidifiers if possible even....you want it low during flowering just to prevent mold from occurring like you have there, and OM is very right....run the dehumidifier(s) at night too if possible, that's when the humidity really climbs....you need to get the RH down and under control asap. Dunno if you can save the grow or not tho... ....Good Luck!
TANKJR Reviewed by TANKJR on . Can anyone identify the problem? plants are 3 weeks into flowering but dont smell and i have noticed some leaves near the bottom have some kind of white fluffy stuff on them which is killing some of the leaves, ive pulled this off the plants and ive included a picture not too sure what this is but im pretty sure its to do with a drop in temperature at night also was a bit wet in the growroom but ive added a dehumidifier and that seems to have sorted that. This must be some kind of mould but i just need to know what mould it is Rating: 5