Four LbR strains (P1, P2, P3, P4) showed a highly suppressive effect on infection by Lb20; the average lesion diameters in the treatments of P1 + Lb20, P2 Lb20, P3 + Lb20, and P4 + Lb20 at six spore ratios (LbR:Lb20, 2:8, 3:7, 5:5, 7:3, 8:2) were reduced by 30–70%, 63–82%, 58–82%, and 75–83%, respectively, compared to the average lesion diameters caused by Lb20 alone at the corresponding spore concentrations. Here, LBR is linked to infection.