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Control of Insect and Related Pests of Livestock and Poultry in British ColumbiaCattle GrubsHost: Cattle Description of Injurious Stages and Damage
Cattle grubs are often collectively referred to as "warble flies",
"bomb flies", or "heel flies." The adult flies are slightly
larger and more robust than honey bees. They do not bite or sting, but their
attempts to lay eggs on cattle often cause animals to run wildly. The larvae or
grubs appear as lumps on the backs of cattle from January to April where they
damage the meat and cut holes in the hide. Weight gains and milk production can
be reduced at this time.
Summary of Life HistoryLife histories of the two species (common and northern cattle grubs) are similar. Eggs are laid on hairs of the lower parts of cattle during sunny days in May and June . Upon hatching the tiny maggots penetrate the skin and slowly make their way to the back by way of the oesophagus or spinal cord. After feeding for some time in lumps (warbles) in the back, they emerge through their airholes (March to April), fall to the ground, pupate (March to early June), and adult flies emerge (late April to mid-June) to repeat the single-generation life cycle. Control RecommendationsLactating dairy cattle - apply rotenone along the backline with a stiff brush when warbles appear on the back, or eprinomectin pour-on between Oct. 1 and Nov. 30. Beef and non-lactating dairy cattle - apply pour-on (fenthion, doramectin, eprinomectin, trichlorfon, ivermectin) or injectable (abamectin, moxidectin, doramectin, ivermectin) products between Oct. 1 and Nov. 30, or bolus (ivermectin) as per label instructions. Note: Non-lactating dairy cattle must not be treated with injectable or pour-on abamectin, ivermectin, doramectin or moxidectin products within 2 months, or with ivermectin bolus within 184 days, of calving.
Black Flies |
Bot Flies |
Cattle Grubs |
Face Fly |
Hog Mange Mite |
Horn Fly
Return to Livestock Pests Factsheet
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