Fig. 4. Number of colony forming units (CFUs) after soil infested with mycelial fragments of Armillaria tabescens was treated with Xenorhabdus bovienii (Xb) and Photorhabdus luminescens (Pl) bacterial broths or concentrated metabolites and streaked onto selective media. Acetone (the metabolite solvent), non-inoculated media broth, and water were applied as controls. Different letters above bars indicate statistical significance (Student–Newman-Keuls’ test, a = 0.05).