The number of sclerotia of Sclerotinia sclerotiorum gradually declined over the years following outbreaks of lettuce drop in four naturally infested fields. The rates of population decline did not differ significantly among the four fields tested. In two fields located in a semiarid region, 5.5 and 2% of the initial amounts of sclerotia were still viable after 7 yr. Sclerotia removed from soil samples were classified by weight into four groups: 14-40, 7-14, 3-7, and 1-3 mg per sclerotium. The frequency distribution of the four sclerotial weight groups changed over the years, as small sclerotia became increasingly predominant over large ones. This trend was significant according to a generalized logit model [...]
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Y. Ben- Yephet (1993) studied this question.