Fig. 1
Log CFU of Escherichia coli O157:H7gfp+ (g fresh weight)−1 isolated from spinach leaves at harvest and propagated on LB with ampicillin and arabinose (N = 12 per treatment). Error bars indicate standard error. Spinach was either seed- or spray-inoculated with three bacterial strains isolated from washed and bagged spinach with known antagonistic effects to E. coli O157:H7gfp+. Inoculation was performed as either a single-strain (Pseudomonas orientalis, Pseudomonas flavescens, Rhodococcus sp.) or multiple-strain (“inoc. all”) treatment. Black bars represent canopy inoculation by spraying. Grey bars represent seed inoculation. The results from the General linear model (GLM) are indicated with asterisk above bars. (p < 0.01*, p < 0.001**, p < 0.0001***)