Fig. 3

Pathogenicity of forage grass affecting X. translucens pv. graminis strains on Italian ryegrass (Lolium multiflorum). Disease severity scores for bacterial wilt ranging from no symptoms (1) to dead plants (9) were evaluated 28 days post infection for four replicates per tested strain. Size of dots indicates the number of replicates allocated to a particular score, each represented by one clonal replicate of the L. multiflorum genotype LmK-01. Orange bars indicate the mean over the four replicates. The six tested strains of Xtg originated from different geographical locations, i.e. Switzerland (Xtg2, Xtg9, Xtg10, and Xtg29), Norway (NCPPB 3709) and New Zealand (ICMP 6431). Asterisks indicate significant differences in comparison to Xtg29 (*** p < 0.001; ** p < 0.01)