Five bacterial isolates collected from dogwood leaves were evaluated for powdery mildew control in shadehouse and greenhouse environments by using foliar sprays and/or root drenching. Two isolates displayed superior bioactivity and suppressed powdery mildew similar to conventional fungicide thiophanate methyl (Cleary’s 3336F®). The two bacteria disrupted powdery mildew spore germination and ruptured spore membranes causing spore lyses. Bacterial filtrates without bacterial cells were also effective in suppressing powdery mildew and disrupting spore germination and suggested the involvement of secondary metabolites. The two biocontrol agents (BCAs) colonized roots endophytically and promoted plant growth.
M.T. Mmbaga, F.A. Mrema, L. Mackasmiel, E. Rotich, "Effect of bacteria isolates in powdery mildew control in flowering dogwoods (Cornus florida L.)", Crop Protection, Volume 89, 2016, Pages 51-57, ISSN 0261-2194, https://doi.org/10.1016/j.cropro.2016.06.011.