Field studies of rotation of acaricides were conducted in a cotton field that had Kelthane and Comite resistant T. urticae. A three year study demonstrated that Kelthane resistance could be reduced through the use of Comite or Zephyr. No change in Comite resistance was observed when Kelthane or Zephyr were used. Treatments that relied on Kelthane or Comite throughout the season were not efficacious because of resistance in T. urticae. The most efficacious treatments and those that helped to reduce pesticide resistance were Kelthane/Zephyr, Temik/Kelthane/Zephyr, and Zephyr/Comite. Single or multiple applications of Zephyr within a season were effective, but should be avoided because they will result in resistance to Zephyr. Both T. urticae and T. turkestani continue to show no resistance to Zephyr and the latter mite species is still susceptible to Kelthane and Comite.