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Boxwood Leafminer

Boxwood leafminer is the most destructive insect pest of boxwood. The larvae of this fly feed on the tissue between the outer surfaces of the leaves. Adult leafminers emerge in late April or early May depending on the weather. The adults are small (3mm), orange, mosquito-like flies.  After mating each female inserts about 30 eggs in the surface of new boxwood leaves. The larvae hatch in about 3 weeks and feed within the leaves from June through early fall. To control the adult leafminers, thoroughly spray the plants with a registered insecticide in late April. If developing mines are observed, larvae can be controlled from late June through the summer by spraying with a foliar absorbed insecticide.