Figure 3

Time series of aggressiveness of vir9 isolates. Infection types on Clement seedlings of 33 isolates carrying the vir9 gene and collected from French populations during two epidemic periods between 1989 and 1997. Large values of infection type indicate high levels of sporulation and thus high aggressiveness. Each point represents the mean of two independent measurements. Four isolates (i5–i8) were used in the field competition experiments.