Monocyclic components of anthracnose caused by Colletotrichum lindemuthianum were quantified on two bean (Phaseolus vulgaris) cultivars Rosinha and Carioca, in growth chambers. Incubation period and disease severity were assessed, at temperatures of 6, 10, 14, 17, 21, 25, 29 and 33 ºC. Anthracnose did not develop at temperatures of 6 and 33 ºC. The severity was highest at 17 ºC and the shortest incubation periods occurred at 29 ºC for the cv. Rosinha and 25 ºC for the cv. Carioca. Beta function was fitted to data of disease severity at different temperatures. The effect of the leaf wetness duration (5, 6, 12, 18, 24, 30, 36, 42, 48 and 54 h) in disease severity was assessed as well. There was no increment in anthracnose severity of the bean for periods of wetness superior to 24 h. The variations of anthracnose in relation to the number of hours of leaf wetness were explained by the Richards model. The Beta-Richards function explained the combined effect of the temperature and leaf wetness duration in the severity of anthracnose, for both varieties.
