Damage from leaf miner larvae — the tunnels or mines that scroll across leaves — is easy to spot. The leafminer parasite (Diglyphus isaea) is a small, black, non-stinging wasp that searches out leaf miners on which to lay its egg. The wasp kills the leaf miner as it lays its egg, and the emerging larvae use the dead miner as food. The adult parasite exits the tunnel sometime later and will then go on to lay 200 – 300 eggs during its nearly month-long life. While destructive leaf miners often survive pesticide treatments because they are protected inside the tunnels, they cannot escape the parasite, which raps its antennae on the mine to locate the miner. Leaves with short or dead-ended mines often indicate the presence of D. isaea.