Cansian, Rogério LuisSouza, Marina Andreia de2021-02-242021-02-242020http://repositorio.uricer.edu.br/handle/35974/288Due to the indiscriminate use of chemical agents and the loss of stored grains, it is necessary to search for new compounds to control insects and fungi. This control can be accomplished through the use of natural insecticides. In this sense, the present work was to evaluate the repellent and insecticidal effect of the essential oil of Cinnamomum cassia in the control of Sitophilus zeamais, as well as its antifungal activity on three fungi Aspergillus flavus, Alternaria alternata and Penicillium crustosum. Repellency activity was determined using plate arenas and mini silos interconnected with food substrate. For the test with the plate arenas, the repellency of C. cassia in S. zeamais was between -0.7 and -0.6, respectively DL30 and DL15 and the dose of 0.34 μL / cm2 (52.86 μL / board), the DL50, provided the highest IP which was -0.9. As for the mini silos, they showed repellents in all tested doses, varied between -1.0 with 1582μL (DL50), -0.8 with 156.73μL (DL30), a correlation was observed (Pearson = 0.99) between the different tested doses and respective preference indexes. For the evaluation of insecticidal activity, Petry plates without food substrate were used. C. cassia oil had a high insecticidal effect, causing 100% mortality from S. zeamais, at a concentration of 120μL / cm². At lower concentrations, insect mortality was less than 22.5%. The antifungal activity tests were performed using the diffusion technique in solid medium using plate cavities. The essential oil of C. cassia showed an inhibition halo value of 30 mm for A. alternata and P. crustosum and 29 mm for A. flavus in the highest concentration tested (10%). From the results obtained, he verified that the oil has an insecticidal and repellent action on S. zeamais, in addition, essential oil is an option in inhibiting the development of fungi.pt-BREngenharia de AlimentosCinnamomum cassiaInseticida naturalÓleos essenciaisTrabalho de Conclusão de Curso