My bud told me about this Liquid Worm Casting product called peak soil. He dilutes it 15 parts to 1 parts juice, for a soil drench, once every 3 weeks. They just go away... Thing is he's got cats and dogs running all over the place, so I was surprised when I paid him a visit to take a look. The brochure says its all about pushing Brix levels up so the critters just fill up with gas and have to look for greener pastures or starve. I have used Neem, and it works for a while, but it makes sense to get rid of mites from the inside out. So now I'm a believer. Extreme plant health is all you need to be rid of the scourge. I got some at Grofax on Colfax in Denver, kind of funny, looks like it's in yogurt containers or something, but apparently good things can come in janky packages too. Now the only neem I use is in my toothpaste. Dang tar stains.