Potato brown rot, caused by Ralstonia solanacearum, has been reported in Egypt many years ago.The disease has created a lot of quarantine problems during the course of exportation of table potatoes to Europe. This work was conducted to study the persistence of Ralstonia solanacearum, the causative agent of brown rot disease of many crops including potato, in different habitats under Egyptian traditional cultivation conditions, along with certain some bacteriological and pathological aspects related to the epidemiology of the brown rot bacterium. Isolation from different soil types, potato...