Shore fly
decaying organic matter on planting substrate. Growers consider shore flies to be mostly a nuisance pest, but the insects can act as vectors for disease organisms [...] are strong, quick fliers and can move throughout a greenhouse readily, they generally remain close to breeding sites. They breed in algae growing on soil [...] r organisms, they do not cause any direct damage to plant production. However, they are considered a nuisance pest because the flies: Leave their feces