. Circular. Insect pests; Insect pests. 11 With vats equipped like the above, from 75 to 80 per cent of the horn flies on the cattle are ; Mr. Hunter experimented with a small model of a dipping vat, and found that if the splash were received on a slightly curved galvanized- iron sheet instead of a board it was considerably more effective in dis- tributing the back throw of the water in the form of an efficient spray. The arsenical dips used for the cattle tick would have comparatively little value for the horn fly except that very likely a good many flies might be caught and de
. Circular. Insect pests; Insect pests. 11 With vats equipped like the above, from 75 to 80 per cent of the horn flies on the cattle are ; Mr. Hunter experimented with a small model of a dipping vat, and found that if the splash were received on a slightly curved galvanized- iron sheet instead of a board it was considerably more effective in dis- tributing the back throw of the water in the form of an efficient spray. The arsenical dips used for the cattle tick would have comparatively little value for the horn fly except that very likely a good many flies might be caught and destroyed by merel}^ being wetted with the dip. A similar treat- ment has recently been the subject of experiment in the West. An apparatus has been con- structed, designed more particularly for the destruction of skin parasites of cattle, to supplant the old method of dipping in a vat. It has been suggested that this apparatus will furnish a very good means of con- trol in the case of the horn fly. The probabilities are, however, from the experience with the horn-fly traps re- ferred to below, that most of the flies would abandon the cattle at the moment of entrance to the cylinder, and its efficiency as a means of horn-fly control is very problematical. The process consists in driving the animals through a large cylinder through the sides of which a powerful gasoline pump causes sprays of the insecticide to strike the animals from all quarters and thor- oughly wet them. This machine is patented and is sold at a rather excessive price. The liquid used is an emulsion of crude petroleum « For further details of the construction of dipping vats see Farmers' Bulletin 378, "Methods of Exterminating the Texas Cattle Tick," by H. W. Graybill, Bureau of Animal Industry. In the case of the vat there described, to successfully use the splashboard it may be necessary to increase the height of the sides of the vat so that the splashboards can be placed 4 feet or a little more abo
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Keywords: ., bookcentury1900, bookdecade1900, booksubjectinsectp, bookyear1904
