Leafminer

Leafminer: (Larva size=1/8 inch)
Many different insects are knows as leafminers, but all share the habit of tunneling between the upper and lower layers of leaves, and creating a visible, random trails or mines in the process. The larvae of tiny black flies are the most common type of leafminer. Adult flies lay eggs on leaf undersides. After hatching, larvae tunnel into leaf to feed, gaining some protection from predators there. They are pests throughout North America, especially in beets, chard, lettuce, peppers, potatoes, and spinach.

Controls
Protect leafy vegetable crops with lightweight garden fabric.

Pick off and destroy infested leaves.

Encourage the various natural parasites that attack leafminers by not spraying pesticides.

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