File:Controlling field rodents in California (1958) (20691895715).jpg

Title: Controlling field rodents in California
Identifier: controllingfield43458stor (find matches)
Year: 1958 (1950s)
Authors: Storer, Tracy I. (Tracy Irwin), 1889-1973; California Agricultural Experiment Station; University of California Agricultural Extension Service; University of California (System). Division of Agricultural Sciences
Subjects: Rodents; Mammals
Publisher: (Davis?) : Division of Agricultural Sciences, University of California
Contributing Library: University of California, Davis Libraries
Digitizing Sponsor: University of California, Davis Libraries

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Fig. 4. Equipment for using carbon disulfide in control of ground squirrels: stock can of carbon disulfide, waste balls of jute, and milk can with tight-fitting cover in which waste balls are soaked in the fluid. A stiff wire (not shown) hooked at one end is useful to lift out waste balls and place them in burrows. all packages show the active ingredient as warfarin. For ground squirrels use is made of the concentrated form (1:200, or 5 per cent), a mixture with flour or other powder that is to be combined with bait in a 1:19 ratio by weight so that the final mixture contains warfarin in a strength of 1:4,000 (about 100 milligrams per pound). On grain baits intended for use with ground squirrels a mineral oil at 1 quart per 15 to 20 pounds of bait may be added to make the warfarin ad- here to the grain; mixing is done as de- scribed for zinc phosphide baits. The final mixture with warfarin must be exposed where the squirrels can feed repeatedly so as to obtain the necessary dose. A covered bait box with holes in the sides large enough to admit squirrels readily is satisfactory. If placed where squirrels are accustomed to feed and play they will soon discover the grain and commence feeding. Warfarin is no hazard to chickens or turkeys, but dogs and cats will be killed if they feed for several days on the bait or if they repeatedly eat rats killed by the poison. In some situations it may be desirable to surround the bait box with a wire fence of large mesh (hog wire) that will admit squirrels but exclude larger animals and children. There is little danger to human beings from warfarin. If a child or adult eats some prepared bait he should be caused to vomit and a physician called at once. Treatment includes transfusion with whole blood of appropriate type and giving Vitamin K by mouth or intra- venously. Carbon disulfide gas. Ground squir- rels and some other rodents can be controlled with poisonous gases. Gases will also kill other animals living in squir- rel burrows, such as skunks, cottontails, burrowing owls, and snakes. The chemi- cals which have been used include carbon disulfide (CS2; often called "carbon"), (16

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