Differential Behaviour of Mycelial Growth of Several Botrytis cinerea Strains on either Patchoulol- or Globulol-amended Media

Botrydial and dihidrobotrydial are two characteristic metabolites of the phytopathogenic fungus Botrytis cinerea, which are involved in the development of necrotic lesions on grapevine and tobacco. Patchoulol and globulol, two natural products which are analogues to precursors of botrydial and dihidrobotrydial, were tested on 10 B. cinerea strains which were isolated from di€erent hosts and varied in aggressiveness on grapevine leaves. Mycelial growth of all strains was prevented when they were grown on either patchoulol- or globulol- amended malt agar media (200 lg/ll). Each strain displayed a speci®c response pattern to those products, according to the high variability previously described for this species. Furthermore, strains were di€erent from one another with regard to their level of aggressiveness against leaves detached from sherry grapevine vine- yards.