Results from a commercial field study showed that the combined use of two insecticides, Phaser and endosulfan, within an integrated pest management strategy significantly suppressed infestations of the boll weevil Anthonomus grandis Boheman. Tests took place at selected cotton fields located in the Brazos River Valley region of Texas. At each site, treatments were replicated four times and arranged in a randomized complete block experimental design. Compared with the foliar spraying of conventional insecticides, timely applications of Phaser and endosulfan proved more effective at eliminating weevils and preserving populations of such beneficial arthropods as Chrysopa spp. adults and larvae, Geocoris spp. adults and nymphs, Eretmocerus spp. adults, Encarsia pergandiella Howard adults, and Hippodamia convergens Guerin adults and larvae. The cost of treating cotton fields with Phaser and endosulfan averaged ＄95.50 per acre. In contrast, the cost of treating cotton fields with conventional insecticideseraged $137.79 per acre.