Experiment were carried out at Sakha Agric. Res. Station, Kafr El-Sheikh, Egypt in 2007 season to evaluate the toxic effect of mineral oil; Capl-2 (96.62% EC) and bio-acaricide; Challenger (36% SC) on the spotted spider mite Tetranychus cucurbitacearum (Sayed).                 Laboratory tests indicated that LC₅₀ values of Capl-2 (96.62% EC) were 3000 ppm and 2500 ppm against adult females and eggs, respectively, while hatchability of mites eggs treated with LC₅₀ increased as the eggs got older, being 36.56, 61.60 and 72.53 for one, two and three-day old eggs, respectively. On the other hand duration of immature stages and total life cycle of this mite, were more prolonged when one, two and three days old eggs were treated with LC₅₀ of Capl-2 oil compared with the untreated ones. Total mortalities of mite immatures were 46.89%, 53.33% and 57.03% when they developed from one, two and three days old eggs treated with LC₅₀ of Capl-2 oil, respectively.                 Under field conditions Challenger (36% SC) with concentration 45 cc/100 L. of water was satisfactory in controlling the mite T. cucurbitacearum on soybean plants (Glycin max Merr.) variety Crowford, since it gave 91.95% reduction in population density. On the other hand, Capl-2 (96.62% EC) at the rate of 1.5 liter/100 L. water gave 73.27% reduction in mite population.