The sweetpotato whitefly (SPW), Bemisia tabaci (Gennadius), is a serious cotton pest in the arid southwest and other parts of the U.S. cotton belt. Control measures are difficult because immatures develop on leaf undersides and most application methods do not effectively deliver control agents to the underside of leaves. Control measures are needed that surmount these problems. Two spray booms were built that were strong enough to penetrate cotton canopies and spray an agent (s) upwards to leaf undersides. Two cotton-seed oils (Natur'l Oil(TM) and Comate(TM)), a soap, a combination of soap and Natur'l Oil(TM), and the synthetic-pyrethroid fenpropathrin (Danitol(TM)) with the organic phosphate acephate (Orthene(TM)) as a possible synergist against SPW were tested at a site in Yuma, AZ and Brawley, CA. In tests with agents that gave at least 20% control, 5% (V/V) Natur'l oil(TM) gave control that ranged from 21-99%; 5% (V/V) Comate', 31-80%; 1% (V/V) soap, 45-94%; 1% soap and 5% Natur'l Oil(TM), 22-32%; 0.20 lb/ac Danitol(TM), 26-83%; 0.20 lb/ac Danitol(TM) and 0.75 lb/ac Orthene(TM), 40-99%; and 0.75 lb/ac Orthene(TM), 20-62%. At the Brawley, Ca site, Danitol(TM) treated plots were not defoliated from SPW infestation and foliage remained green. A significant increase of 1.48 C in leaf temperature was observed in leaves coated with hone dew from SPW (P< 0.01).