Answer: If there really are leaf miners within the leaves of your plant, you can control them by removing and destroying the infested leaves. Leaf miners are the larvae of a fly (Liriomyza). The adult lays an egg in a slit she's made in the leaf. The egg hatches into a little worm which tunnels through the leaf tissue, between the upper and lower leaf surfaces (a little like eating the center out of an Oreo cookie). Because they are protected on the inside, they are usually not affected by pesticides. When the worms grow big enough, they exit the leaves on a thin web and pupate in the soil, emerging as adults some time later. To stop this process, either squish the critters, or remove the leaves and destroy them.
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