dont spray the plants with anything! thats the problem they have humiditty, cut away any moulding buds before it spreds to the rest of the plant, i was gonna say fit a dehumidifier, but with the aircon it should be dehumidifying anyway, i have to put humidifiers in my grow rooms to get the humidity back up above the 60% the aircon leaves it, there is no water sitting in the aircon! i asume it is a split unit!
what is your humidity levels in the grow chambers, room?
and i stick to extraction and airflow! even if you have aircon it can have dead areas of air that need moving plenty, some species of sativas and sativa heavy hybrids do suffer with mould, normally the more common mildew, as you say this is white i feel it is more than likely to be a fungas rather than mould! the remedy is a very dry room and plenty of air circulation.

good luck

welcome to the world of endless possibilities,,,,,hydroponics
mistyganjatree Reviewed by mistyganjatree on . OMG MOLD, MOLD, and more Mold I am growing hawain purple kush, and purple erkel. Im about done, and all plants are in heavy bud stage,about 2 weeks ago I noticed some white powder mold on the kush leaves, I looked ot the erkel and didnt see mold on it.I have my plants in bedsone side is erkel, and the other is kush. I treated all my plants with spray, and it seemed to work, but last night I seen that the mold was back, not alot, but enough. I figure I have about 20 days left till I harvest, I was going to get a sulfer Rating: 5