2026-03-052026-03-052023-12-20https://repositorio.ifal.edu.br/handle/123456789/1426Tomato is the second most consumed vegetable in the world and has great socioeconomic importance. However, its productivity is directly affected due to the crop's susceptibility to attacks by various phytopathogenic microorganisms. Bacteria from the Ralstonia solanacearum Species Complex are responsible for the most infectious and devastating bacteriosis of crops in countries with tropical and subtropical climates, bacterial wilt, caused by the obstruction of xylem vessels as a result of the production of exopolysaccharides. The only efficient control measure for this disease is the use of resistant cultivars. Therefore, the objective of this work was to use phytopathometric variables in bacterial wilt in tomato cultivars inoculated with two isolates of Ralstonia pseudosolanacearum. The experiment was conducted from October to November 2023 in a greenhouse at the Instituto Federal de Alagoas – Campus Piranhas. The experimental design used was completely randomized in a factorial scheme (10 x 2), containing 10 tomato cultivars and two isolates of the species Ralstonia pseudosolanacearum, totaling 20 treatments in three replications, resulting in 60 experimental plots, containing four plants each. Using the diagrammatic scale of bacterial wilt scores, phytopathometry of the disease was carried out using the variables: Incidence (INC), Bacterial Wilting Index (BWI), Disease Index (DI), Latency Period (LP50), Area Under Disease Progress Curve (AUDPC) and Infection Rate (IR). These variables were obtained for the interval of the 5th - 10th and 15th - 20th day of evaluation. There was a significant interaction between Cultivars x Isolates, for the following variables: BWI, AUDPC, IR (5th - 10th day of evaluation) and for IMB, ID, and TI (15th - 20th day of evaluation). The variables LP50, INC, IR, and AUDPC characterized the beginning of the bacterial wilt epidemic from the first evaluation interval, regardless of the cultivars and isolates. The cultivar Hawaii 7996 was classified as resistant to isolate CRMRs108, and the cultivar Bartô was classified as moderately resistant to both isolates. The phytopathometric variables were efficient in showing the interaction of host, pathogen, and environment in the evaluation intervals.ptSolanum lycopersicum L.BacterioseQuantificação de doençasEpidemiaBacteriosisDisease quantificationEpidemicTrabalho de Conclusão de CursoCIENCIAS AGRARIAS