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Control of Insect and Related Pests of Livestock and Poultry in British
Columbia
Horse and Deer Flies
Host: Cattle, Hogs, Horses, People
Description of Injurious Stages and Damage
Adults are medium to large flies sometimes referred to as
"bull-dogs." Adult females pierce the skin and suck blood, causing
great annoyance to animals, interrupting grazing, with loss of weight gain in
beef cattle and reduction of milk yields from dairy cattle. Cattle and horses
will often seek shelter in dense bush or in buildings to avoid horse and deer
fly attack.
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Horse Fly |
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Deer Fly |
Summary of Life History
Life histories of our various species of horse and deer flies are not well
known. Eggs are laid on stems and leaves of aquatic plants. Larvae live in the
mud close to water, perhaps for a year or two, before pupating and emerging as
adults. Adults are most active on warm sunny days.
Control Recommendations
No satisfactory protective sprays are available. Temporary relief may be
obtained from repellent sprays. Darkened shelters or areas of deep shade into
which animals can escape from the flies should be made available.
Black Flies |
Bot Flies |
Cattle Grubs |
Face Fly |
Hog Mange Mite |
Horn Fly
Horse & Deer Flies |
House Fly |
Lice |
Mosquitoes |
Poultry Lice
Chicken Mite & Northern Fowl Mite |
Sheep Bot Fly |
Sheep Ked |
Stable Fly |
Ticks
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