. Control of rats and mice. Rats; Mice. 'i^^'^F' Fig. 15.—-Use of pump with calcium cyanide dust to gas rat burrows. Courtesy of U. S. Pub- lic Health Service. rodents die in 3 to 6 days. This chemical contains fluorine and must not be used where it might contaminate food. The dust should not be stirred up, and under no circumstances should kernels of cereals on floors dusted with fluosilicate be swept up and used as food for man or animals. The law states that no food product may carry a residue of fluorine in excess of grain per pound. Products found to contain more may be seized by go
. Control of rats and mice. Rats; Mice. 'i^^'^F' Fig. 15.—-Use of pump with calcium cyanide dust to gas rat burrows. Courtesy of U. S. Pub- lic Health Service. rodents die in 3 to 6 days. This chemical contains fluorine and must not be used where it might contaminate food. The dust should not be stirred up, and under no circumstances should kernels of cereals on floors dusted with fluosilicate be swept up and used as food for man or animals. The law states that no food product may carry a residue of fluorine in excess of grain per pound. Products found to contain more may be seized by govern- ment authorities, and the owners may be prosecuted. In some places sodium fluosilicate may be put down in a narrow strip on the floor close to the walls in a room or building. Then boards may be leaned along the floor and against the wall to prevent the dust from being scattered to nearby ob- jects. Rats and mice usually run along the bases of walls, and tend to go beneath boards so placed. 31. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Storer, Tracy I. (Tracy Irwin), 1889-1973. Berkeley, Calif. : College of Agriculture, University of California
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