Shore fly
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 Scatella [...] muddy lake shores and intertidal zones, and they breed readily in other moist environments. In greenhouses, adults feed on algae and their larvae on algae [...] quick fliers and can move throughout a greenhouse readily, they generally remain close to breeding sites. They breed in algae growing on soil, pots, benches