A tank mixture of fenpropathrin plus acephate (0.22 + 0.56 k/ha) was tested in several trials in AZ/CA in 1992 to determine efficacy on strain B of sweetpotato whitefly (Bemesia tabaci Gennadius) in cotton. All testing was with ground equipment and the number of applications in the tests varied from 3 to 10 on either a 7 or 14 day interval.

The fenpropathrin plus acephate tank mixture was consistently a top performer in these trials as evidenced by evaluations of adult, egg, and nymphal forms of sweetpotato whitefly and by the significant yield increases produced compared to the untreated controls. In the only trial that was applied on a 14 day interval, the fenpropathrin plus acephate tank mixture had yields significantly greater than all other products being tested.