Greenhead horseflies are prevalent in Essex County, Massachusetts, particularly impacting beachgoers during summer. These flies emerge from salt marshes in late June and are managed by trapping around 485 flies yearly. Despite attempts to reduce their numbers, these pests can still maintain a disruptive presence. The painful bites can interfere with outdoor activities but do not transmit diseases. Preventive measures include appropriate clothing choices and avoiding attractants. Greenhead activity is expected to diminish in September.
The green-eyed horsefly, known as greenheads, emerges from salt marshes in late June and becomes a significant problem on Massachusetts beaches, particularly in Essex County.
Barry Noon from the Northeastern Massachusetts Mosquito Control and Wetlands Management District sets 485 traps annually, capturing 5,000 to 8,000 greenheads to manage their population.
Greenheads bite during the day, attacking persistently, which disrupts enjoyment of coastal areas in summer, causing painful bites but no disease transmission.
To minimize bites, people can wear lighter clothing, dry off after swimming, and avoid sprays or perfumes that may attract greenheads.
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