Pesticide drift occurs whenever pesticide leaves the intended target site through the air during or soon after application. Pesticide drift may cause injury to farm workers and other people, particularly children, adjacent crops or other non-target plants, livestock, sensitive environments, fish and wildlife. Even if visible injury does not occur, illegal residues may be present in adjacent areas. Pesticide drift may also result in regulatory fines, legal liability, and litigation. When pesticide drift occurs, some part of the pesticide is not reaching its intended target, and the potential benefit from the application is reduced. The likelihood of pesticide drift will be reduced if the applicator understands the relationships among pesticide product, application equipment, and site and weather conditions.