We've had a horrible problem with mites this year. we've held them back using neme oil. rosemary oil, pyrethrum and spraying with water. depending on your local humidity ( we're in the high desert) misting with water will work. but watch out for mold! the oils all worked some but you have to be very careful not to burn the leaves and you will need to repeat the treatment. don't use the pyrethrum as it will kill all the bugs including the good ones and then oh boy. best thing is to not let them in. nest year we will not have any spider mites as we will be extra careful in the beginning. only 2 weeks left so it'll be ok but the plants would have been even better!!