Abstract: The experiment was conducted at the Crop Science and Production Department Laboratory of the Sokoine University of Agriculture, Morogoro, Tanzania. The general objective was to investigate the potential and effectiveness of botanicals in controlling the bruchid beetle Z. subfasciatus. Bean grains of two commercial bean cultivars viz: SUA 90 and Kablanketi were used as test materials. Botanicals which were used during the experiment include pyrethrum flower powder, garlic powder and nyongwe powder. Standard Actellic super dusts as a synthetic chemical and without pesticide as controls were also used. A split plot experiment in a Completely Randomized Design (CRD) was used for arrangement of treatments. Data collected included number of live insects, number of holes per seed, damaged seeds, percentage damage and weight loss. Results showed that both bean varieties and treatments differed significantly for all the investigated variables. Kablanketi had more live Z. subfasciatus, number of holes seed ‾1, damaged seeds; percentage damaged and weight loss than SUA 90. Number of live insects was less in seeds treated with Actellic super dust than no pesticide application treatment. Seeds treated with Actellic super dust and pyrethrum excelled other treatments by having low number of holes per seed, damaged seeds, percent of damaged seeds and weight loss. On other hand, Garlic and nyongwe performed better in reducing number of holes per seed, damaged seeds, percentage damaged seeds and weight loss than no pesticide application treatment. Therefore, these three botanicals possess insecticidal properties that can be used in the control of insect pests on stored beans.