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A very large number of studies have addressed the characteristics of Sclerotinia sclerotiorum (Lib.) de Bary and of the diseases it causes on several hosts, such as bean, soybean, lettuce, carrot, sunflower and many other crops. However, the processes composing the disease cycle have been studied separately in these crops. The disease cycle of Sclerotinia diseases is complex. This cycle can be divided in four broad phases corresponding to typical pathogen structures of the pathogen life cycle. These phases correspond to the formation and biological functions of four different types of propagules and four stages in the disease cycle are therefore distinguished: (1) sclerotia, (2) ascospores or apothecia, (3) infectious mycelium in the petals, and (4) infectious mycelium in the canopy. An ethograph graphically synthesizes knowledge relevant to epidemiology of a disease. In this study, successive versions of an ethograph were used to discuss the phenomenology of the bean white mould cycle and to highlight relationships among S. sclerotiorum propagules, successive stages of the disease, and bean development stages. The first stage takes into account the amount of overwintering sclerotia. The second stage is characterized by the number of apothecia and ascospores produced at the blooming period. The third stage describes the processes involving the number of infected petals at the blooming period. The fourth stage concerns the spread of infectious mycelium, which accounts for disease spread from diseased to healthy vegetative tissues. The ethographs developed in this Chapter describe the phenomenology of bean white mould through the examination of the several stages of the disease cycle in more detail than is usually attempted and taking into account the concatenation of events. The building process was especially useful to identify key stages

Modelling propagule effects in bean white mould epidemics