Bar graphs reporting the results based on mean percentage values of symptom severity. (A) CymRSV, (B) CMV, (C) PVX, and (D) PVY display the measurements taken in days post-inoculation (dpi) intervals represented as T1 = 5 dpi, T2 = 7 dpi, and T3 = 12 dpi. Each bar represents a different treatment: nontreated, virus-infected plants (CymRSV, CMV, PVX, and PVY) and virus-infected plants treated with either strain R8 [Paraburkholderia], R16 [Paenibacillus], 255-7 [Pantoea], 260-02 [Pseudomonas], or a chitosan-based product (CHI). Error bars indicate standard error. Asterisks indicate significant differences among the results according to a nonparametric Wilcoxon rank-sum test followed by Bonferroni methods compared with virus-infected, nontreated plants (* for p < 0.05, ** for p < 0.01, and **** for p = 0.000).