You are now on the AHDB Horticulture and Potatoes website.
Please click here to access the main AHDB website and other sectors.
Please click here to access the main AHDB website and other sectors.
This poster includes the most common pests and diseases of onion and leek crops. You can use this poster to easily identify symptoms and damage caused by diseases such as white rot, leaf blight and downy mildew and help spot key pests.
You can use this poster alongside the alliums crop walkers' guide.
This information was last updated in 2019.
© Agriculture and Horticulture Development Board 2025 | All Rights Reserved
Agriculture and Horticulture Development Board, Middlemarch Business Park, Siskin Parkway East, Coventry, CV3 4PE