In recent yearsAnthonomus grandisBoheman has invaded the High Plains, where it currently presents a potential threat to cotton in most of the area. A large-scale insecticidal control program was conducted during each of the years 1964–70 to control the insect. The programs were effective in preventing economic boll weevil damage to cotton in the High Plains. Despite these control efforts, low numbers of the insect advanced many miles west into previously uninfested counties of the High Plains during 1967–69. Distribution of the insect during 1964–70 in the High Plains and adjacent areas of West Texas is presented.