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Utah State University Extension

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Agromyzid leafminers are small black-and-yellow flies that are pests of vegetable and ornamental crops throughout the world. In Utah, three species of leafminer flies attack vegetable crops: American serpentine leafminer [Liriomyza trifolii (Burgess)], pea leafminer [Liriomyza huidobrensis (Blanchard)], and vegetable leafminer [Liriomyza sativae (Blanchard)]. All three species are native to the New World (Western Hemisphere) but have spread worldwide. In the U.S., leafminers are most problematic in the southern states from Florida to California, and in Hawaii. Allium leafminer, [Phytomyza gymnostoma (Loew)] is a recent invasive pest to the northeastern U.S. that targets both wild and cultivated allium (onion) hosts.

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