I've heard that Azamax and Azatrol are safe to use later in harvest and will kill both the mites and eggs. However I suppose that means you will end up with mite corpses on your buds... at that point though, you're basically jsut trying to salvage what you can.

I saw a few of those bastids on my plants, and I've been carefully examining them daily and hitting them with a mix of Einstein Oil neem and Safer soap when I notice anything. I've only seen 2 or 3 actual mites on my plants (both in veg and flower room), but my G-13 was totally covered a few weeks ago, and I was able to get rid of it (it had small webs near the bottom and all). I'm just keeping a close eye on the situation, but I will definitely be giving my room and house a thorough cleaning for the next batch. I'm 2 weeks into flower and will discontinue the neem/Safer after this week to be safe (assuming I end up having to do another application) -- another 6-7 weeks will be enough to work any residue out and if I have to, I can hit them with Azamax towards the end. I'm mostly just keeping my temps low (get up to 77 or so during the day and down to ~63 at night), trying to keep them moist, and hitting them with a fairly strong fan since the mites don't like that.

Aside from an actual humidifier, what is the best way to increase humidity? I'm in a grow tent with a pretty strong exhaust fan (replaces the air about 3x per minute), so it seems like whatever it is, it would really need to produce some humidity to keep up, especially with our dry semi-desert air.