Greenhead flies are back with a vengeance. Heres what to know.

Greenhead flies are causing disruptions on Massachusetts beaches, especially along the North Shore's Great Marsh area. Barry Noon, director of the Northeastern Massachusetts Mosquito Control and Wetlands Management District, reported that his team sets 485 traps each season, capturing about 5,000 to 8,000 flies. This effort aims to keep their population manageable for beachgoers. The flies are notorious for their painful bites, which can provoke allergic reactions, although they do not transmit diseases. Officials warn that the females bite during daylight and can travel significant distances, affecting both people and domestic animals.

To minimize bites, experts recommend wearing lighter clothing and drying off after swimming. The greenhead season typically wanes by September, providing some relief to beach visitors. Managing these pests is crucial for maintaining the enjoyment of coastal areas during the summer months.