Leaf Miners
Many species of wasp, fly and moth lay their eggs on the outside of a plant, and the larva hatches and buries itself inside the leaves or stems, eating from the inside.
Mine on a leaf of Sorrel
Mine created by a species of fly (Pegomya)
Many species of wasp, fly and moth lay their eggs on the outside of a plant, and the larva hatches and buries itself inside the leaves or stems, eating from the inside.