. Control of field rodents in California. Rodents; Mammals. 18 California Agricultural Extension Circular 138 Gassing with Carbon Disulfide. Ground squirrels and some other rodents can be controlled with poisonous gases. Gases will also kill other animals living in squirrel burrows, such as skunks, cottontails, burrowing owls, and snakes. The chemicals which have been used include carbon disulfide (CS2; often called "carbon"), carbon monoxide (CO), sulfur dioxide (S02), methyl bro- mide (CH3Br), hydrocyanic acid (HCN), chloropicrin (CC1,N02), and tetra- chloroethane (C2H2C14). Carbon
. Control of field rodents in California. Rodents; Mammals. 18 California Agricultural Extension Circular 138 Gassing with Carbon Disulfide. Ground squirrels and some other rodents can be controlled with poisonous gases. Gases will also kill other animals living in squirrel burrows, such as skunks, cottontails, burrowing owls, and snakes. The chemicals which have been used include carbon disulfide (CS2; often called "carbon"), carbon monoxide (CO), sulfur dioxide (S02), methyl bro- mide (CH3Br), hydrocyanic acid (HCN), chloropicrin (CC1,N02), and tetra- chloroethane (C2H2C14). Carbon disulfide is the gas most widely used for ground-squirrel control. This liquid chemical takes fire and burns readily; it evaporates easily and. Fig. 4.—Equipment for using carbon disulfide on waste balls in ground-squirrel control: stock can of carbon disulfide, waste balls of jute, and milk can with tight- fitting cover in which the waste balls are soaked in the fluid before being placed in the burrow. A stiff wire (not shown) hooked at one end forms a convenient means of lifting out waste balls and placing them in the burrows. quickly; and, in the vapor or gas state, it is highly explosive. Stocks of carbon disulfide should be tightly stoppered to prevent loss and should be stored out of doors in a cool, shady place free from fire, sparks, or exposed lights. The fluid corrodes tin cans readily. Carbon disulfide is poisonous to man and to most animals, but it does not readily kill fleas. Since it is heavier than air, carbon disulfide will settle in the lowest parts of an underground burrow, and will not pass higher than the burrow mouth unless forced up with a pump. The fluid vaporizes and spreads more rapidly at high air temperatures, but when 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
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