Biting midge

The biting midge (Culicoides punctatus) is a small dipteran insect belonging to the family Ceratopogonidae. While often overlooked due to their tiny size, these insects are significant vectors of viral diseases affecting livestock globally, making them a major concern for veterinary and agricultural health management.

Although they do not feed on plant tissues, their role as pests is defined by their hematophagous behavior. They are well-known vectors for the Bluetongue virus (BTV) and the Schmallenberg virus, which cause severe outbreaks in sheep, cattle, and goats. These diseases cause substantial economic losses due to mortality, abortion, and international trade restrictions.

The biology of Culicoides punctatus is governed by the need for moist substrates for breeding. Females lay eggs in moist soil, decaying vegetation, or manure piles. The larval stages are aquatic or semi-aquatic, developing in areas with high organic content. This dependency on moisture means that farm management of liquid manure and water runoff is critical for population control.

The damage caused by these insects is primarily due to their aggressive biting behavior. During peak activity periods, particularly dawn and dusk, swarms can cause intense irritation and allergic dermatitis in livestock. Constant irritation leads to animal restlessness, loss of appetite, and significant reduction in meat and milk yield due to stress and lack of sleep.

Effective management strategies focus on habitat modification and chemical protection. Reducing breeding sites by draining stagnant water, improving drainage systems, and regular removal of waste material are essential. Additionally, the application of insecticidal pour-ons and ear tags on livestock, along with the use of fine-mesh screening in barns, provides a multi-layered defense against these pests.