 Spinach leafminer larvae and damage Spinach Leafminer Adults are slender gray flies about 6 mm long. Larvae are small, white, flattened maggots up to 8 mm long. The larvae feed between the lower and upper leaf surfaces. Loss of foliage from heavy infestations may retard plant growth and reduce yield. Host plants: sugarbeets, spinach, beets, lambsquarters, nightshade.
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