Nine race-stock-derived, day-neutral strains were compared with two susceptible cultivars ('Stoneville 213' and 'Deltapine 41') and with a resistant frego-nectariless breeding strain (La.81-56OFN) for relative field resistance to the boll weevil (Anthonomus grandis grandis Boh.) and for anther number and mass per flower. Field resistance (free choice) was confirmed in four strains (MT 109, MT 330, MT 763, MT 1180) and identified for the first time in two strains (MT 323, T 1219). Their levels of resistance were similar to that of La. 81-56OFN. The race-stock-derived strains had as many or more anthers per flower but less than or equally as much anther mass per flower as the checks. All race-stock-derived strains were late and unproductive; nevertheless, they show promise as previously unutilized sources of resistance to the boll weevil that should be exploited in germplasm enhancement and cultivar development.