I use Einstein Oil for spidermites. Its expensive but last a long time. I mist with 1/2 tsp per qt. of water plus CocoaWet to make it stick to the leaves. Its hot where I live so I have to mist every two to three days veg or flower to keep the mites under control. Anytime you mist with anything, make sure the lights are out so you dont burn the buds and spray the top and bottom of leaves. If you mist while flowering dont use Einstein Oil after your final flush and it wont affect the taste or smell.