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Allium leaf miner

The Allium Leaf miner (Phytomyza gymnostoma) was first found in the UK in 2002-3. It can damage leek, garlic, chives, onion and other Allium species. Whilst it originally appeared to be confined to gardens and allotiments, particularly in the West Midlands, it has been seen recently in commercial crops in the West Midlands (leek and salad onion). There are some useful links below:

Information from the RHS

Pest risk analysis by CSL (Now Fera)

There are some useful images in these documents:

Swiss information sheet (PDF Document)

French information sheet (PDF Document)

Another French information sheet (PDF Document)