The effect of mixed plantings of resistant and susceptible cotton cultivars on cotton fleahopper preference and damage were compared with uniform plantings of the same cultivars. Mixed plantings of the resistant cultivars (R), CAMD-E and SP-37H, and the susceptible cultivars (S), CAB-CS and ORSBO, caused a change in insect behavior measured as host preference and plant damage, compared to uniform plantings. Fleahoppers in mixed stands appear to move back and forth between resistant and susceptible plants allowing greater fruit set. Cotton yields were increased at final harvest in all mixed plantings compared to uniform plantings. These data suggest the best mixed planting was SP-37H and CAB-CS at the ratio of 75:25 (R:S), respectively. The exact mechanisms causing these yield increases are not understood.