Results of three years of field and greenhouse studies on the effects of the fungicides azoxystyrobin, carbendazin, mancozeb, tebuconazole, fentinhydroxide, pyraclostrobin, tryfloxistrobin + cyproconazole, tryfloxistrobin + propiconazol and chlorotalonil on the epidemiology of bean web blight and bean yields are reported. Field experiments were conducted during the rainy seasons of 2004/05, 2005/06 and 2006/07. Experimental design was a randomized complete block with four replicates. In 2004/05, fungicides were applied only once, 45 after planting (DAP); in 2005/ 06, there were two applications at 30 and 45 DAP, and in the 2006/07 field season, three applications were made, at 30, 45 and 60 DAP. Disease severity was estimated weekly, with aid of a 1 (healthy) to 9 (more than 90% diseased leaf area) disease scale. Disease progress rates were calculated following curve fitting to th e lo g is ti c m o d e l . R e s u l ts s h o w e d th a t o n e s in g l e f u n g i c i d e Costa-Coelho, G.R; Lobo Júnior, M.; Café-Filho, A.C. Epidemiology of Thanatephorus web blight and grain yield of the common bean treated with fungicides. Summa Phytopathologica, v.38, n.3, p.211-215, 2012. application, 45 DAP, was inefficient for disease control (mean disease progress rate r = 0.2348). When number of applications increased, and started earlier (at 30 DAP),efficiency also improved for all active principles (mean r = 0.1988 and 0.1671 in 2005/06 and 2006/07, respectively).Overall, lowest disease severities were observed with fentinhydroxyde, tryfloxistrobin + propiconazole, tryfloxistrobin + cyproconazoleand. The protective and curative effects of all fungicides were assessed in the greenhouse, by applicationat pre-or post-inoculation, respectively. Efficiency was evaluated by measurement of lesion diameter. All fungicides presented curative and protective effects, whereas best results were observed in preventive application. A high negative correlation was found between web blight intensity and yield, and increase in grain yield with fungicide applications reached 304 % over control plots. A avaliação da severidade da doença foi feita semanalmente, atribuindo-se notas de 1 (sem sintomas) a 9 (acima de 90% da área foliar destruída) e taxas de progresso da doença foram calculadas após o ajuste das curvas de progresso ao modelo logístico. Os resultados mostraram que uma única aplicação de qualquer dos produtos, Costa-Coelho, G.R; Lobo Júnior, M.; Café Filho, A.C. Epidemiologia da mela e produtividade do feijoeiro-comum tratado com fungicidas. Summa Phytopathologica, v.38, n.3, p.211-215, 2012. aos 45 DAP, foi ineficiente para o controle da taxa de progresso da mela (taxa média, r = 0,2348). A eficiência do controle aumentou com o incremento do número de aplicações e aplicações mais precoces, iniciandose aos 30 DAP (médias de r = 0,1988 e 0,1671 em 2005/06 e 2006/07, respectivamente). Com três aplicações,as menores severidades de doença foram observadas com hydróxido de fenil estanho, trifloxistrobina + propiconazol e triflox...