Reducing water stress in cotton significantly reduces whitefly infestations. Drip irrigation provides the most effective method of application for reducing water stress and reduces whitefly infestations by about 50%. By increasing the frequency of furrow irrigation, either by using additional water or by more frequent irrigations with smaller amounts of water, whitefly infestations are reduced by about 30%. The reductions in whitefly infestations in well-watered cottons were not sufficient to avoid insecticide control. Additional yield may offset increased water costs depending on water costs.