god forsaken powdery mildew!
i have struggled with PM a few times in the past myself......growing in oregon, the air can get super moist, and if you make the mistake of pulling your intake air from directly outside, this can cause PM in a constantly rainy place. Also, humidity is a huge part inside your room, and YGB had perfect advice. However, stray away from Neem strait up....i recently have been using Greenlight's Fruit Tree Spray, which has Neem and Pyrethrium (sp?) which is WAY more effective, and actually way more safe to use (they advertise "Use Up To Day Of Harvest!", but i dont know about that......) Really, keep using it until that shit disappears, and like YGB said, KEEP YOUR ROOM CLEAN! between runs get that room spotless and you can prevent it. the best way to get rid of powder is to not allow it in in the first place! if it gets in.....use GreenLight Fruit Tree Spray! hope this helps....
Green Light Fruit Tree Spray
Only been using this stuff for a year or so, but def has been working well...turned on to it by a buddy who manages a growshop here Oregon, http://www.greenlightco.com/products...ecticides.html
second one down..........good shit.