S Control of Potato Bacterial Soft Rot Disease Caused by Erwinia carotovora subsp carotovora with Streptomyces sioyaensis and Cinnamon Oil
OFT rot of potato is one of the most important diseases caused by Erwinia carotovora subsp. carotovora. Possibilities of its biological control were investigated by the use of some actinomycetes antagonists for controlling E. carotovora subsp. carotovora. A total of 40 different actinomycetes strains were isolated from the rhizosphere soil of healthy potato plants collected from different localities of Dakahlyia Province, Egypt. These were then tested, in vitro, for their antibacterial activity against E. carotovora subsp. carotovora using an agar disc method. Eight isolates were active against E. carotovora subsp. carotovora and the most active isolate was selected for further tests and characterized by conventional methods. Morphological, physiological and cultural characterization of the most active isolate established that it was closely related to Streptomyces sioyaensis.