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Fly control and a resulting savings in money can be obtained by forcing cattle on pasture to walk between dust bags containing an insecticide on their way to and from water or salt and mineral.
James E. Roberts, Virginia Tech Extension specialist in entomology, said this easy, self-treatment is effective against both horn and face flies—the two major pests of cattle on pasture.
Both pests reduce weight gains and have been linked directly to the increase of pinkeye in a herd.
The College of Agriculture and Life Sciences faculty member said increased weaning weights potentially can return $10 for every $1 invested in dust bags and insecticide.
He based the statement on tests in Nebraska where controlling horn flies with dust bags increased weaning weights an average of 13 pounds per calf. At 40 cents a pound for feeder calves, the extra sale weight would be
95.1%