If you suspect mites, you might want to try a solution of 1 part isopropyl alcohol, 2 parts water, and a dash of Dawn dishsoap in a spray bottle. Mist the plants twice a day, not till they are soaking, but wet. I work at a University garden and we use this solution to control most pests, as it does not damage the plants and will kill most common pests. Also it is pretty darn safe to use for both people and the plants.