The allium leafminer, Phytomyza gymnostoma, is a fly that originates from Poland, Germany, Austria and Spain, and was confirmed in 18 counties in Pennsylvania last year.
The fly infests plants in the Allium genus, including leeks (A. porrum) onion (A. cepa), garlic (A. sativum), chive (A. schoenoprasum), shallot (A. cepa var. aggregatum), and green onion (A. fistulosum). We’ve also found feeding signs on wild garlic (A. vinealae), garlic chives (A. tuberosum), and an ornamental– Allium ‘Globemaster’ (A. christophii x A. macleanii).
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