Soil solarization reduced both recovery and viability ofSclerotinia minor sclerotia depending on the depth of burial. Highest reduction of these parameters was obtained at 4–6 cm depth (55%) and 0–2 cm depth (96%) respectively. Soil solarization accelerated the exponential decay of sclerotia observed in natural soil. In the upper 6 cm of soil this decay was so fast that after about 14 days loss of the sclerotial viability approached values recorded at the end of the treatment after 41 days. The number of sclerotia colonized by microorganisms is higher in solarized than in non-solarized plots.