Pyrethrum TR 4.0% will kill em all. Heres a link to about the cheapest you'll find:
http://www.ebay.com/itm/Pyrethrum-TR-2-oz-Total-Fogger-Insecticide-Whitmire-BASF-3-pack-/381453085812?hash=item58d0602c74:g:HeEAAOxyw3NTmIeo
Gotta have a strict maintenance schedule set up to keep them gone or they can build an immunity to pesticides.
I had russets bad at one point and this is how I got rid of them for going on about 6 months now I believe:
Buy (2) 2 oz pyrethrum foggers @ .4% pyrethrum active ingredient. They are good for up to 3000 sq ft.
Dont bother buying "Doctor Doom" brand cuz they are weak @ .04% vs .4% for the Pyrethrum foggers. They are good for up to 3000 sq ft.
1. Clean entire room from top to bottom with a 10% bleach water solution. Vacuum every square inch of the room. Mop the floors with bleach water solution as well. Be sure to wipe down and sterilize
ALL equipment that was in use or in the grow room with alcohol wipes or something similar..
2. Blow off a Pyrethrum fogger in your room.
*******Be sure to do this with all fans/lights/pumps/ballasts or any other electrical item that can create a spark since the foggers have a flammable propellant.
Allow 2 hours time for the fogger to settle after going off then go in the room then turn on exhaust fans and circulating fans.
3. Repeat step 1.
4. After 3 days repeat step 2 by using the second Pyrethrum fogger. Dont clean the room after the second fogger.
The reason for the second bombing after the 3rd day is due to the fact that the pyrethrum wont kill the eggs of the few that may have still lived after the nuclear assault. When the mites get bombed like that, it is in their genetics to basically hatch their eggs as a means of survival. Bomb number 2 is what kills off everything left after bomb 1. Total eradication.
From here on out I would build a maintenance routine of 1 pyrethrum fogger every 4 weeks or so and be sure to use a neem oil spray to mist entire plants top to bottom (leaf undersides included) at least once before introducing any plants into the room. Once plants have been introduced into the room you can use the neem oil spray as a preventive about 2 times a month.
The pyrethrum foggers are safe to use in a room with plants as well since the pyrethrum wont hurt the plants -but if they are placed too close to plants, the propellant will burn the leaves. Id give about 1-2 feet distance of the fogger and any plants if possible.
You can safely use the foggers up to the last week before harvest also.
DO NOT USE THE FOGGER IN A CLOSED TENT.
Been running this for many months since my russet mite ordeal that ruined all my clones and mommas. I have a thread and pics on here somewhere showing my outbreak.
I've been free of any Russet Mites since my total nuke and maintenance program.
Best of luck to you!!