The description, pathogenicity and epidemiology of Phytophthora boodjera, a new nursery pathogen of Eucalyptus from Western Australia

摘要: When this study was commenced in November 2011, a recent outbreak of damping-off diasese Western Australia (WA) nursery had indicated the presence new Phytophthora species. Despite industry standard hygiene, disease continued across years. The impact caused great concern as plants grown there were intended for environmental plantings and hence posed risk introducing species into natural environment. This raised many questions to be cleared: (1) pathogen species, (2) it only or could infect older seedlings trees, (3) did have narrow broad host range, (4) how get survive from year year, (5) persist plantings, (6) endemic Australia? project addressed all these questions. A boodjera described. It has relatively range is Eucalyptus. P. especially pre postemergence with susceptibility decreasing age. Older trees damaged root systems but not die. Within survived between seedings debris used trays. Immersion 5% Calcium hypochlorite using dry heat at 65oC 2 hours eliminate inoculum. Tracing infected showed that can environment if introduced. While common recovered urban planting, extensive sampling ecosystems very few isolates boodjera. Based on low recovery high Eucalyptus tested I conclude WA.