Allium Leaf Miner – Leek pest

Tagged: Leaf Miner, Leeks, Onions

This topic has 3 voices, contains 3 replies, and was last updated by icotter 106 days ago.

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30 November, 2011 at 10:05 pm #491
icotter	As discussed at tonights AGM. I had the Allium Leaf Miner last year for the first time in my leeks, it apparently started in the West Midlands and has been moving in this direction for some time. They burrow into the laves and stems, the larvae are white grubs and the pupa are brownish about 5mm long, we found a lot of these brown pupa when preparing leeks to cook. The recommendation is to fleece them at the flying times of the pest in March/April and September/October. The FERA advice sheet is at internet URL http://www.fera.defra.gov.uk/plants/plantHealth/pestsDiseases/documents/phytomyza.pdf
5 December, 2011 at 9:59 pm #496
admin	Thanks for the info and welcome to the forums! Also, congratulations on being the first ever contributor! It would be nice to see more information like this posted on here, so come on people – we’ve got a fantastic allotments and loads of knowledge out there. Let’s hope this is the first of many posts appearing here -here – ere – ere – re – e – e This reply was modified 167 days ago by admin. This reply was modified 167 days ago by admin.
29 January, 2012 at 7:42 pm #539
David Kenyon	Hi Ian, I haven’t read the Defra sheet.. does it atttack onion sets? I’ve lost almost 200 again the leaves get distorted and they stop growing… I’ve put a second sowing in under fleece.
29 January, 2012 at 8:04 pm #541
icotter	Apparently it does but I have not had trouble with them up to now, I am generally late putting them in which may explain it! Advice is to fleece from February, the flies are supposed to be active March/April and October/November but this winter is a bit odd so they may be out early! My leeks did not show any external signs, just grew slowly and were tunneled/rotting when lifted. The FERA data sheet says Host Plants Napomyza gymnostoma is a pest of Allium spp., particularly leeks, onions (bulb, and spring), garlic, and chives. It is also a potential pest of ornamental Allium spp. There is a Which? gardening sheet as well at http://www.which.co.uk/documents/pdf/allium-leaf-miner-231881.pdf this says that it has been seen on Spring grown Onions. I hope that helps!

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