This project aims to improve disease control in Australian onion crops by developing rapid, species-specific molecular diagnostics for key canopy pathogens, Stemphylium vesicarium (SLB), Alternaria porri (Purple Blotch, PB), and Peronospora destructor (Downy Mildew, DM). Genome sequencing will be used to understand pathogen diversity and fungicide resistance, with in vitro and field trials assessing fungicide efficacy.

For growers, the project will deliver faster, more accurate diagnostics, enabling targeted disease management and improved crop protection. Outputs include improved disease control via optimised fungicide use, and extension materials to support integrated crop management. The findings will also benefit diagnostic labs and inform broader horticulture biosecurity strategies.

This project has been funded by Hort Innovation, using the research and development levies listed below and contributions from the Australian Government. Hort Innovation is the grower-owned, not-for-profit research and development corporation for Australian horticulture.

• Onion Fund