A survey of cotton aphid populations in three different regions of boll weevil eradication (BWEP) in Mississippi was conducted in the summer of 2000. Because eradication efforts were begun at different times, each region was in a different phase of BWEP. Region 1 was involved in the first full season of BWEP, while Regions 2 and 3/4 were in the third and fourth years, respectively. By July 1, survey fields in Regions 1, 2, and 3/4 had received an average of 1.83, 0.83 and 2.16 ULV malathion sprays respectively, which were applied as part of BWEP. Counting early season treatments that growers applied to control pests other than boll weevils or aphids, fields in Regions 1, 2 and 3/4 received a total of 3.50, 1.83, and
2.83 non-aphicide sprays, respectively, by July 1. Region 1 received significantly more aphid sprays (average of 1.0 sprays per field) than either Region 2 (0.5 aphid sprays per field) or Region 3/4 (0.17 aphid sprays per field). Highest aphid populations were observed in Region 3/4, peaking at an average of 81.48 aphids per leaf. However, aphid populations in Regions 1 and 2 were suppressed by the higher number of aphid treatments applied in these regions.