We’ve had customers report very good success with russet mites, but it takes diligence. Protocol is 2oz per gallon applied every 48hrs for 2 weeks, then down to every 72hrs for a week, then down to once weekly at preventative dose of .5oz per gallon. Spider mites can be tricky, especially if they are well established. Their webbing actually acts like a canopy and protects them from the spray. We usually recommend vacuuming the webs off before spraying for best results.