[en] Competitiveness of Callosobruchus analis F. was studied from the adult emergence resulting when males irradiated with substerilizing doses of 1.5, 3 and 5 Kr. of gamma radiation and were confined in various ratios with unirradiated pairs of weevils. Egg production and longevity of a female decreased with the increase of irradiated males in the combination in each dose level. 1.5 Kr. population at a ratio of 9:3:3 (Irradiated male: unirradiated male: unirradiated female) produced 47.60% sterility. Increasing the irradiated males in the ratio to 15:3:3 and 24:3:3 caused 57.61 and 61.24% sterility respectively. Sterility increased with the increase of radiation dose in all combinations. Weevils irradiated with all these doses were fully competitive. (author)