Sparrow louse fly

The sparrow louse fly (Ornithomya fringillina) belongs to the family Hippoboscidae, order Diptera. It is a specialized ectoparasite adapted to living within the plumage of birds.

Adult individuals have a flattened body covered with stiff bristles, allowing them to move easily between feathers. The color ranges from yellowish-brown to olive-green.

The insect has powerful legs with claws that firmly hold it to the host's body even during the bird's rapid flight. The imago measures approximately 4–6 millimeters.

This species has well-developed wings, which distinguishes it from other members of the family that may lose their flight organs. This enables the fly to actively migrate between birds.

The mouthparts are adapted exclusively for piercing skin and feeding on the blood of warm-blooded hosts. The compound eyes are large, providing a good view for hunting.

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Although this object is not a pest of agricultural crops, it causes significant damage to poultry farms by reducing overall productivity and bird health.

Parasitism by the louse fly causes severe distress in birds, leading to decreased egg production in layers and slower weight gain in broilers.

The fly is a mechanical and biological vector for various pathogens. Through bites, viral, bacterial infections, and blood parasites can be transmitted.

Mass reproduction of flies in nests leads to the exhaustion of chicks, restless behavior, and, in some cases, the death of young birds due to constant blood loss.

Damage to the bird's skin provokes dermatitis, itching, and subsequent pecking of the affected areas by the bird itself, which ruins the market quality of the carcass.

The active period of the fly's life cycle begins with the arrival of the warm season, when the primary hosts — migratory and resident birds — become active.

The peak population density is observed during the summer months. At this time, the most intensive reproduction of insects occurs in the nests.

In autumn, with cooling and the migration of many bird species, parasite activity declines. However, in warm poultry houses, the cycle can continue longer.

Insects overwinter mainly in the pupal stage in nesting litter or in secluded areas of the premises where poultry is kept.

Temperature is a key factor determining the rate of larval metamorphosis and the overall fertility of female louse flies throughout the season.

The main sign of infestation is unusual restlessness in birds, expressed by frequent preening and attempts to peck at their own backs or wings.

Upon examination of the bird's carcass, one can notice the rapid movement of insects under the feathers, especially in the chest area and under the wings.

The presence of specific pupae in the nests, which look like dark, rounded capsules, indicates a high degree of infestation in the poultry house.

A decrease in weight gain or egg production despite adequate feeding is often a hidden symptom of the constant presence of blood-sucking parasites.

Characteristic bite marks — small red dots, local inflammation, and signs of scratching — are found on the birds' skin.

To protect poultry stocks, it is necessary to carry out regular sanitary treatment of premises using approved insecticidal preparations.

It is important to remove and destroy old nesting materials in a timely manner, as pupae and adult parasites tend to accumulate in them.

The use of special sprays and powders authorized for poultry treatment allows for effectively reducing the number of flies on the host's body.

• Ensuring cleanliness in aviaries and cages.
• Using repellent compounds for walls and perches.
• Quarantine for new birds to prevent the introduction of the parasite.

Biological control may include attracting natural enemies of the insects, but the chemical method of disinsection remains the most effective.