. Control of field rodents on California farms. Rodents. pass higher than the burrow mouth unless forced up with a pump. The fluid vapor- izes and spreads more rapidly at high air temperatures, but when it is put into burrows during the warm dry season much gas may be lost through surface cracks in the ground. Carbon disulfide is applied in two ways: with a special pump to force the fluid or gas into a burrow, or by soaking waste balls in the fluid and then placing them in the burrow. Formerly the gas was ignited a few seconds after the disul- fide was pumped into the burrow, but this practice
. Control of field rodents on California farms. Rodents. pass higher than the burrow mouth unless forced up with a pump. The fluid vapor- izes and spreads more rapidly at high air temperatures, but when it is put into burrows during the warm dry season much gas may be lost through surface cracks in the ground. Carbon disulfide is applied in two ways: with a special pump to force the fluid or gas into a burrow, or by soaking waste balls in the fluid and then placing them in the burrow. Formerly the gas was ignited a few seconds after the disul- fide was pumped into the burrow, but this practice has been given up, for the most part, because it takes longer and is a fire hazard. When conditions permit firing the gas, however, somewhat better control seems to result. Ten or 15 seconds after introducing the gas, a bit of paper or a small kerosene-soaked rag on the end of a stick or a stiff wire, 4 to 5 feet long, is lighted with a match and inserted into the open burrow. The operator stands several feet to one side to avoid being ;.-:;!.:â â¢â f.'v-. %^0^. 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; Jameson, E. W. (Everett Williams), 1921-. [Berkeley, Calif. ] : Division of Agricultural Sciences, University of California
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