Lale, N.E.S.Ajayi, Folorunso A.Sastawa, B.M.Odo, P.E.2023-12-112023-12-112002-01-28N. E. s. LALE*؛’ F. A. AJAYI2, B. M. SASTAWA, AND p. E. ODO1 Department of Crop Science, Faculty of Agriculture, University of Maiduguri, p. M. B. 1069, Maiduguri, Nigeria; and 2School of Pest Control, Federal Department of Pest Control, Mando Road, Kaduna, Nigeriahttps://keffi.nsuk.edu.ng/handle/20.500.14448/3036Background: Sorghum (Sorghum bicolor ) is one of the most important cereals especially in the semi-arid tropics providing the staple food for large populations in Africa and Asia. It is, however, susceptible to secondary insect pests in storage. Methods: In this study, the effects of grain breakage and processing method on the development of Tribolium castaneum in grains and products derived from 10 local cultivars of dry season (Masakwa) sorghum obtained from Cameroon, Chad and Nigeria were investigated under tropical storage conditions. Results-. Results show that broken grains, whole flour and polished (lour obtained from sorghum cultivars UN-33-2-EX Chad, Bulwalana-bama, Soulk-12-Ex Cameroon, Bumku-gajibo, and Bourgou,i-28-Ex Came- roon were more suitable diets for the development of T. castaneum than undamaged grains. These substrates supported significantly 0.05كي ) higher populations of 7. castaneum larval and adult progeny than undamaged grains. Broken grain or whole flour derived from Bulwalana-mutukum-musini, Bulwalana-bama and Adja’ama-mutukum-pulka was infested significantly more than polished flour derived from the same cultivars. The study has also shown that cultivar Bulwalana-bama with a mean of progeny was, on average, the most susceptible to T. castaneum infestation whereas Bulwalana-yashawa with a mean of 67.5 progeny was the least susceptible of all the sorghum cultivars screened. The order of preference by castaneum for the different products obtained from the sorghum cultivars for optimum development was broken grains>whole flour polishcd flour>undamaged grains. Conclusion: It was concluded that the bran of Bulwalana-mutukum-musini, Bulwalana-bama and Adja'ama- mutukum-pulka possibly contain nutrients that may be beneficial for the development of castaneum and its removal by polishing reduces the susceptibility of flour derived from these cultivars.enGrain Breakage, Threshing, Polishing, Sorghum, Tribolium casteneumArticle