You've probably harvested by now, but next time you discover spider mites early in the crop use pyrethrines (preferably naturally occuring though sythetics work just as well). Lightly mist both above and below the leaf. Repeat every 5 days for 3 cycles. Make sure to water your plants well at least 6 hours prior to spraying. Do not soak the plant. Spray LIGHTLY. This will end the spider mite problem unless you reinfect them. If you find them towards the end of the crop cycle Safer's Soap will control them well enough to make it to harvest with minimal damage. I do not recommend any oils including neem, rosemary or cotton seed oils as they tend to block the plant's stomas, decrease respiration and can burn new growth shoots. Pyrethrins have been outlawed in CA but can be purchased in many other states. Naturally occuring pyrethrins used to be available at K-Mart in a one quart spray bottle. I haven't seen it lately. Really good stuff that if used properly will take them out efficiently.