Determining the efficacy of Xenorhabdus szentirmaii metabolites and trancinnamic acid against plant pathogenic fungus, Botrytis cinerea

In this study we evaluated the inhibitory effect of cell-free supernatant of Xenorhabdus szentirmaii and trans-cinnamic acid (TCA), against Botrytis cinerea in petri and pot experiments. In petri assays, the different concentrations of TCA and X. szentirmaii were mixtered in the media of B. cinerea and mycelial growth of fungus was followed. All tested concentration (%0.5, %1 ve %2) of TCA inhibited mycelial growth of B. cinerea better than X. szentirmaii. In pot experiments, different combinations of TCA and a synthetic fungicide were applied lettuce seedlings which infected with B. cinerea. At the end of experiments, TCA was as effective as fungicide. Whereas no synergistic interaction was detected between combined application of the lower concentrations of fungicide and TCA. Only antagonistic interaction was detected between all experiment groups.