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 [...] close to breeding sites. They breed in algae growing on soil, pots, benches, and other surfaces and the female disperses her tiny (0.1 mm) eggs on the surface [...] live in and just beneath the algal crust growing on top of the soil/medium, where they feed on algae, bacteria, yeasts and other microorganisms. In 3–6