Leaf miners feed on fleshy soft leaf tissue. The damage looks like tunnels have been carved through the insides of the leaves. Another form of leaf miner damage looks like small holes with brown or discolored edges over the surface of the leaves.  Although the leaf miners do not generally move from leaf to leaf, a heavy population of these insects can cause widespread aesthetic damage to the host plant.

Control of leaf miners can be best achieved in the late summer before the young insects move inside the host plant's leaves. Systemic controls can also be used when they are actively feeding in the spring.