Yes, 1/8 t. to a gallon of water. You can add a surfacant if you want, but not necessary. Some people spray when the plant(s) in bloom. The obvious - don't spray in full sun/heat of the day or when rain is predicted. ;-)

mites are a female dog you just have to keep treating them I use forbid , neem, avid and a few other chemicals and they always come back , always quarentten new plants and spray them a few times
spider mites hate humidly so keeping your plants damp helps and the mites grow slower in cool temps