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Control of Insect and Related Pests of Livestock and Poultry in British ColumbiaSheep Bot FlyHost: Sheep, Goats Description of Injurious Stages and Damage
Greyish flies about 15 millimetres long deposit living maggots in the nostrils
of sheep. Much harm is done to sheep by the larvae moving and feeding in the
nasal passageways and sinuses of the head (sometimes called "gid" or
"worm-in-the-head"). Sheep under attack from bot flies will run,
gather in groups with heads down, or rub their noses on the ground to prevent
egg-laying.
Summary of Life HistoryThe sheep bot fly is common wherever sheep are raised in B.C. The larvae live in the nasal passages and sinuses of the head for about 10 months. When fully grown they are sneezed out upon the ground and in a short time change into the pupal stage. In a few weeks the adults emerge and the life cycle is repeated. It is believed that there is one generation per year.Control RecommendationsApply ivermectin (0.08% ready-to-use oral drench) following label instructions. Use proper drenching equipment.
Black Flies |
Bot Flies |
Cattle Grubs |
Face Fly |
Hog Mange Mite |
Horn Fly
Return to Livestock Pests Factsheet
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