This method is less certain than that of removing the grubs, and has the further objection that the dead grubs remain beneath the skin.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
In order that none may escape it is advisable to examine the cattle every two weeks during the late winter and spring, at each examination removing the grubs which have developed sufficiently to cause perceptible swellings.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler
By passing the hand over the backs of the animals the swellings marking the location of the grubs may be readily found.
"Special Report on Diseases of Cattle"
U.S. Department of Agriculture J.R. Mohler