Shore fly
direct damage to plant production. However, they are considered a nuisance pest because the flies: Leave their feces (as black flecks) on the foliage of [...] flies of the genus Scatella are a common greenhouse pest found throughout the United States, Canada and northern Mexico. In Europe and Asia, the species [...] algae and their larvae on algae and decaying organic matter on planting substrate. Growers consider shore flies to be mostly a nuisance pest, but the insects