Adult shore flies do not cause direct damage to plants but they are nuisance to greenhouse workers. Shore flies are also help to disseminate diseasing causing fungal spores from plant to plant as they disperse through the greenhouse. Furthermore droppings of shore flies often reduce the aesthetic values and marketability of many ornamental plants and vegetables. Shore fly maggots (larvae) do not cause any damage to plants but they can feed on algae that usually grow in the greenhouses.
Shore flies lay over 200 eggs on algae. Eggs hatch within a day into small maggots that start feeding on algae. Maggots mature within a week and pupate on or near to algal mat. Adults emerge from pupae within 6 days. Under favourable conditions, shore flies can complete one generation in 10-12 days.