Allium leaf miner
Allium leaf mining fly was first detected in Britain in 2002, it has become a widespread in England and parts of Wales. The larvae bore into the stems and bulbs of leeks, onions, chives and garlic. Affected plants often develop secondary infections and rot.
Latin name Phytomyza gymnostoma
Plants affected Leeks, onion, chives, shallot and garlic
Main symptoms Lines of white mines on leaves, maggots or brown pupae in the stems and bulbs
Caused by Maggots of a leaf mining fly
Timing March-June and September-November
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