Highland midge

The Highland midge (Culicoides impunctatus) is a small blood-sucking insect of the Ceratopogonidae family, order Diptera. While not a direct threat to plant life, it is considered a significant agricultural pest due to its devastating impact on livestock health and welfare, particularly in temperate and humid regions.

The biological cycle of this midge is highly dependent on environmental conditions. Females typically lay eggs in wet, organic-rich soil found in marshy areas, peatlands, or near damp vegetation. The metamorphosis involves larval and pupal stages that require stable moisture levels. Consequently, environmental changes such as drainage can significantly alter their population density.

The primary damage is caused by the females, which swarm in large numbers to feed on the blood of mammals. These bites cause severe irritation, allergic dermatitis, and intense itching. Livestock affected by swarms show significant signs of distress, which leads to reduced grazing time, loss of weight, and diminished milk production, ultimately impacting the farm's profitability.

Furthermore, Culicoides impunctatus plays a crucial role in disease transmission. These midges are known vectors for various viruses, including the Bluetongue virus and Schmallenberg virus. By facilitating the spread of these pathogens among cattle, sheep, and goats, they pose a severe threat to regional veterinary security and international animal trade.

Management and protection strategies are essential for maintaining herd health:

• Implementing land management practices, such as drainage, to reduce larval breeding grounds.
• Applying insecticidal and repellent products directly to livestock.
• Using fine-mesh netting to protect housing and milking parlors from adult midges.
• Monitoring population levels using light traps to determine the timing of intensive treatment.