Under field conditions，control efficacy of bifenazate 43% SC 20、25、30 g·（667 m²） ^-1
against Tetranychus urticae Koch was evaluated. The results showed that one application of bifenazate agent at
the initial stage of Tetranychus urticae Koch occurance，the control effect was the best，quick acting and with
persistence. The control rate of Tetranychus urticae Koch was over 85% at the 7th day after using bifenazate 43%
SC 30 g·（667 m²） ^-1 . All treatments had no harmful effect on strawberry growth and non-target animals.