Summary of Outcomes

Pathogen Identification and Surveillance: Over 430 plant pathogens were documented in a new St Helena database, enhancing local knowledge of threats to biodiversity and agriculture. Extensive surveys across the Peaks National Park and other sites revealed the widespread presence of Phytophthora kelmanii, and pathogenicity testing confirmed P. kelmanii as a key cause of dieback in endemic Whitewood and likely to be responsible for the die back in She Cabbage trees. Further pathogenicity testing is needed to confirm this and other species susceptibility. Particularly for the other cabbage trees exhibiting worrying decline. 

Soil and Water Testing: More than 440 soil samples were collected and analysed, with results showing the presence of the pathogen in restoration sites, paths, and even undisturbed areas. Testing of water catchments revealed the potential for long-distance pathogen spread, reshaping restoration planning.

Improved Nursery and Crop Health: Diagnostics and tailored management plans were produced for indoor tomato and lettuce production. Disease-free seedling production protocols are now in place to support habitat restoration.

Strengthened Local Capacity: A refurbished plant pathology lab, new diagnostic equipment, and hands-on training for over 30 staff and students have enabled St Helena to detect, monitor and manage plant diseases independently.

Integrated Conservation Action: New management plans and phytosanitary protocols are helping to reduce disease spread in the cloud forest, while drone technology and GIS-linked tree health databases can support long-term monitoring and restoration.