Two-spotted horsefly

The two-spotted horsefly (Hybomitra bimaculata) is a large insect species belonging to the order Diptera and the family Tabanidae. It is a common pest in temperate regions, recognized as one of the most aggressive blood-sucking flies that frequently attack domestic animals and farm workers.

From an agricultural standpoint, Hybomitra bimaculata is primarily a concern for livestock management rather than direct plant damage. However, the presence of large swarms on grazing lands significantly impacts the efficiency of farm operations by inducing stress and physiological disorders in cattle, sheep, and horses.

The biology of this species involves a complete metamorphosis. Adult females require a blood meal to facilitate egg production. The larval stage is generally spent in wet, organic-rich substrates or near aquatic environments, which makes the direct eradication of breeding sites challenging in vast rural landscapes.

The harm caused by these pests includes painful bites that lead to inflammation, skin irritation, and severe allergic reactions. Because of the constant annoyance caused by these flies, livestock consume less feed, rest poorly, and experience significant drops in milk yield and weight gain. Furthermore, they are potential vectors for several animal diseases.

Management and protection strategies focus on the following:

• Application of approved insecticides and repellents on animal skin to prevent biting.
• Deployment of specialized horsefly traps, such as black ball traps or sticky panels, on pastures.
• Providing shaded areas or shelter for animals during the peak hours of fly activity.
• Environmental management, including the draining of minor stagnant water sources to limit larval development.