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(A–D), represent four different phenolic acids respectively. Effects of different concentrations of phenolic acids (a- P-Hydroxybenzoic acid, b-vanillic acid, c-ferulic acid, d-p-coumaric acid) on mycelial growth of fungal pathogens that cause alfalfa root rot. Error bars indicate standard errors of the means of three repetitions. Different letters above the bars indicate significant difference according to Duncan’s multiple range test (P = 0.05).
