Fig 2. Mean aggressiveness (n = 12 plants) of 28 Clavibacter michiganensis subsp. nebraskensis strains estimated from foliar blight severity on maize hybrid DKC 55–09.

Plants were inoculated at the V3–V4 crop developmental stage and foliar blight severity was rated as the proportion of leaf area affected six days after inoculation. Bars represent standard errors of the mean. *Strain 91-R was included as a reference for pathogenicity in this experiment.