Haematobia irritans

Definition

A small, blood-feeding muscid fly (Diptera: Muscidae), commonly called the horn fly, native to Europe and introduced to North America where it is a major pest of cattle and other livestock. Adults aggregate on hosts to feed repeatedly on blood, causing irritation, reduced weight gain, and secondary infections; larvae develop in fresh cattle dung. The species was described by Linnaeus in 1758 and is the type species of the genus Haematobia.

Etymology

New Latin: Haematobia from Greek haima (blood) + bios (life), referring to the blood-feeding habit; irritans Latin for irritating or provoking, describing the fly's pestiferous behavior.

Example

Populations of Haematobia irritans on dairy cattle can exceed 4,000 flies per animal during peak season, prompting integrated pest management strategies involving feed-through insect growth regulators and pasture rotation.

Synonyms

• horn fly

Related Terms

• Haematobia
• Muscidae
• Diptera
• myiasis
• Integrated Pest Management
• livestock entomology
• haematophagy
• Coprophagy

Usage Notes

The name is binomial and invariant; do not pluralize the Latin epithet. The common name 'horn fly' refers to the fly's habit of clustering at the base of cattle horns, though it feeds across the body. Distinguish from the stable fly (Stomoxys calcitrans), another muscid pest with similar habits but different larval ecology. Two subspecies are recognized: H. i. irritans (widespread) and H. i. exigua (Asian buffalo fly).