2020/11/23 by Barbara A. Wilson, B. A. Wilson, K. Annett +7 · 16 citations
Agricultural and Biological Sciences · Environmental Science · #Agroforestry #Biodiversity #Biology #Botany #Ecology #Geography #Habitat #National park #Peatlands and Wetlands Ecology #Phytophthora #Phytophthora cinnamomi #Plant Pathogens and Resistance #Rangeland and Wildlife Management #Species richness #Threatened species #Vegetation (pathology) #Woodland
paper · open access · doi:10.1071/bt20054
published in Australian Journal of Botany 68(8), 542-556 (CSIRO Publishing)
openalex publication_date 2020/11/23 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/25
The significant impacts of the introduced plant pathogen Phytophthora cinnamomi on native Australian vegetation have been well documented, but there is less knowledge of long-term effects. We assessed long-term (26 years) disease progression and impacts on vegetation floristics and structure at a heathy woodland site in the Great Otway National Park, eastern section. Disease progressed dramatically between 1989 and 2005 and by 2015 only 0.08% of the site was non-diseased. There were significant declines in plant species richness and numbers of susceptible species; and increases in percentage cover of resistant sedges and grasses overall, and in cover of Leptospermum continentale (prickly tea-tree) in post-disease areas. There were significant declines of Xanthorrhoea australis (Austral grass-tree), a keystone species that contributes greatly to vegetation structure and fauna habitat. There is an urgent need to map the distribution of P. cinnamomi affected vegetation and identify floristically important non-diseased vegetation in the national park. It is imperative that quarantine of non-infested areas, phosphite application, track closures and vehicle wash-downs be implemented to reduce disease extension and protect the significant biodiversity of the region including species rich heathlands and nationally listed threatened plant and fauna species and their habitats.