Haematobia

Lepeletier & Serville, 1828

horn flies

Haematobia is a of biting muscid commonly known as . are obligate blood-feeders on cattle and related bovids, with . The genus includes approximately 8 described , with being the most economically significant pest of cattle in North America. develop exclusively in fresh cattle manure. Heavy cause substantial economic losses through blood loss, reduced weight gain, and decreased milk production.

Haematobia irritans (Linnaeus, 1758) labelled as Stomoxys irritans Fabr. (Panzer & Sturm 1793), whitened, clean by Georg Wolfgang Panzer; Jakob Sturm. Used under a Public domain license.

Fauna Germanica, Diptera 1793, vol.1, p54, Stomoxys irritans Fabr. by Georg Wolfgang Panzer; Jakob Sturm. Used under a Public domain license.

Horn flies by Scott Bauer. Used under a Public domain license.

Pronunciation

How to pronounce Haematobia: /ˌhiːməˈtoʊbiə/

These audio files are automatically generated. While they are not always 100% accurate, they are a good starting point.

Images

Habitat

Pastures and confined cattle operations where fresh manure is available for larval development. Associated with bovine livestock housing and feeding areas.

Distribution

Widely distributed in cattle-raising regions globally. Documented in North America, South America (Colombia), Europe (Denmark, Norway, Sweden), and other regions with intensive cattle production.

Seasonality

increase from late spring through early fall, peaking in midsummer. Activity declines with cooler temperatures.

Diet

are obligate blood-feeders, taking multiple meals per day from cattle. Each feeds 20-40 times daily, consuming less than 2 milligrams per meal. feed on microorganisms in fresh cattle manure.

Host Associations

Bos taurus - primary domestic cattle; principal blood source for
Bubalus bubalis - water buffalo; H. exigua specifically associated

Life Cycle

Females in groups of 3-7 on or under edges of fresh pats. Eggs hatch within 24 hours. develop rapidly, reaching maturity in 3-5 days, then crawl to drier portions of manure to pupate. Pupal stage lasts 6-8 days. Complete development from egg to takes 10-20 days depending on temperature. Adults emerge and immediately seek cattle , where they remain continuously except when females leave to oviposit.

Behavior

remain on animals nearly continuously, clustering on withers, back, and sides. When ambient temperature exceeds 32°C (90°F), move to the belly. Females leave hosts only to on fresh manure. Adults feed repeatedly throughout the day, causing cattle to exhibit irritation behaviors: tail switching, skin twitching, shaking, and kicking at bellies.

Ecological Role

Blood-feeding of cattle. Documented mechanical of vivax and T. evansi in Colombia. Serves as for various including predatory , , and of Hydrotaea and Muscina . (Muscidifurax and Spalangia spp.) attack .

Human Relevance

Major economic pest of cattle industry, causing losses exceeding $1 billion in North America through reduced weight gain, decreased milk production, and hide damage. Threshold for economic intervention: 200-250 per animal. Controlled through , sprays, pour-ons, and emphasizing manure management. Documented to (since 1984) and (since 1970s).

Similar Taxa

Stomoxys calcitransBoth are blood-feeding muscids of similar size (~5 mm) and gray coloration. have wider range (cattle, horses, humans, dogs), rest on nearby surfaces between feeds rather than remaining on host, and breed in decaying hay/straw mixtures rather than fresh manure alone. Stable flies have more prominent piercing projecting forward.
Musca domestica are larger (~6 mm), have sponging non-piercing mouthparts, four dark thoracic stripes, and do not blood-feed. They breed in various decaying matter, not exclusively fresh manure.

More Details

Vector capacity

While traditionally considered an annoyance pest, H. irritans has been identified as the main potential of bovine ( vivax and T. evansi) in high-tropical dairy regions of Colombia, representing an atypical transmission pattern compared to -dominated systems elsewhere in South America.

Botanical control research

including nepetalactone (catnip), (chrysanthemum), and show promise as alternative and , potentially avoiding rapid development due to multiple bioactive compounds with varied modes of action.