Geographical and phenological patterns in the mortality of immature boll weevil,Anthonomus grandis grandisBoheman, were observed within cotton buds in three regions of Texas during 1983. Boundaries of the geographical regions (eastcoastal, northcentral, and midwestern Texas), were determined based on patterns of mortality contributed by parasitism, predation, and desiccation. Predation was the dominant factor contributing to boll weevil mortality in cotton in the eastcoastal region, accounting for an average of 58% mortality. The red imported fire ant,Solenopsis invictaBuren, was the major predator of the boll weevil in the eastcoastal region. In the midwestern region, desiccation accounted for an average 57% of immature weevil mortality. In the northcentral region, boll weevil mortality was almost equally distributed among parasitism (23%), predation (23%), and desiccation (30%). Parasitism occurred most often in the northcentral region, although it was not the dominant mortality factor in any region. The hymenopteranBracon mellitorSay was the major parasite of the boll weevil. Average boll weevil mortality occurring in the egg stage was<8%. Mortality attributable to disease in the larval through teneraI adult stage was<9% in all three regions. Despite the varied contributions of each mortality factor, total mortality was fairly equal among geographical regions; total mortality was 82% in the northcentral region, 71% in the midwestern region, and 64% in the eastcoastal region.