In the period 1998-2001, a study was carried out in several sugar beet fields of northern Italy to determine the distribution of sensitivity to SBIs fungicides within populations of Cercospora beticola from the Po Valley. The study showed a decrease in the sensitivity level of some fungal strains grown on fungicide amended medium. In spite of the high number of tested fungal strains (1550), it was not possible to draw final conclusions about the real magnitude of this phenomenon; however, the progress of the situation has to be studied further and, in the meantime, the anti-resistance strategies must not be neglected.