This is damn good stuff. You cannot go wrong applying this.
https://www.pestrong.com/467-mavrik-aquaflow-insecticide-miticide-qt.html
" for use on ornamental plantings "
There are a lots of methods to eradicate mites. Two spot are nothing to fear, and even russet hemp mites can be dealt with. The trick is stay on them. Spray them every other day or even every day, with organic miticides such as Plant Therapy. Those ornamental sprays can be very toxic to humans. Some cause seizures.