Pest description and crop damage This pest is most commonly in young stands. Very localized damage within a field may result in some seedling die-out. Larvae (small, white maggots) mine between the epidermal layers of grass blades. Moisture stress coupled with the chlorotic symptoms produced by the miner can kill seedling grasses.
Parasitic wasps often prey heavily on leafminer larvae. As a result, leafminer populations crash-a good biological control that suppresses quite a few future generations of the fly.
Chemical control usually is not recommended. Dimethoate applied to control other pests on the grass seed label has been observed to give good control.