The boll weevil, Anthonomus grandis Boheman, has been an occasional pest in Arizona cotton production for many years. In 1965, the final year of a period of stub (perennial) cotton culture, infestations were recorded from several areas of central and western Arizona. Plow-down regulations were reinstated following that year and boll weevil infestations were notreported until 1978 when stub cotton was again permitted in the state. Boll weevil infestation developed in a few stub cotton field a in Western Maricopa county that year. Infestations gradually increased until 1981 when populations were first found in planted cotton fields. In 1982, after which stub cotton production was again banned, significant expansion of boll weevil infestations occurred in both stub and planted cotton. Contrary to earlier occasions, when boll weevil populations disappeared with the banning of a tub cotton production, infestations of the insect have continued to expand and intensify in 1983 and 1984.