The major objective of this study was to assess in vivo on detached berries the effect of viticultural
yeasts on phytopathogenic fungi involved in grape sour rot. Yeasts that were found to be effective in vivo
againstthe fungi were assayed for their possible pathogenicity in humans: growth at 42 ◦C, pseudohyphal
formation, adhesion, and phospholipase and protease activity.Atotal of 234 yeasts belonging to 14 genera
were assayed against the following pathogens: