Highland midge

The Highland midge (Culicoides pulicaris) is a small dipteran insect belonging to the family Ceratopogonidae. While they do not feed on plant tissue directly, they are significant pests in agricultural environments due to their aggressive biting behavior towards livestock, which affects overall farm productivity.

These midges are hematophagous parasites, feeding on the blood of cattle, sheep, horses, and poultry. The intense irritation caused by their bites leads to severe animal stress, decreased weight gain, reduced milk yield, and potential secondary skin infections, causing considerable economic distress to farmers.

The lifecycle of Culicoides pulicaris involves complete metamorphosis: egg, four larval stages, pupa, and adult. They require moist environments for breeding, such as waterlogged soil, decaying organic matter, and manure heaps. The larvae are aquatic or semi-aquatic, thriving in high-humidity conditions where they feed on microorganisms.

Beyond the direct physical damage, these insects are notorious vectors for serious livestock viruses, most notably the Bluetongue virus and Schmallenberg virus. These diseases can cause high mortality rates in livestock and lead to severe trade restrictions, making the control of these midges a top priority for veterinary health.

Management and protection strategies focus on environmental modification and chemical control:

• Eliminating breeding sites by draining stagnant water and muddy areas.
• Proper management and coverage of manure and compost piles.
• Using insecticide-treated netting or screens in livestock housing.
• Applying livestock-safe repellents and pour-on insecticides during peak activity seasons.