The Effectiveness of Calcium Cyanide in the Extermination of the Black Tail Prairie Dog, Cynomys Ludovicianus (ORD.)

Autor:	Otis Wade
Rok vydání:	1924
Předmět:	Ecology biology General Medicine Fluid ounce (US) Prairie dog Burrow biology.organism_classification Cynomys ludovicianus chemistry.chemical_compound Animal science chemistry Insect Science biology.animal Calcium cyanide
Zdroj:	Journal of Economic Entomology. 17:339-342
ISSN:	1938-291X 0022-0493
DOI:	10.1093/jee/17.2.339
Popis:	The efficiency of calcium cyanide as a control for prairie dogs was tested in 1922 and 1923 in Kansas. The flake form of the chemical was used in dosages of ¾, 1, 1 ½, and 2 ounces. The material was placed in each burrow entrance from 1 to 2 feet. below the rim. In three "dog towns" doses of 1, ½, and 2 ounces were used and all entrances to dens closed. Total kills resulted in each instance. Eight infested areas were treated with ¾, 1, and 1½ ounce doses and all burrow entrances left open. In the two tests with 1 ½ ounce doses total kills were obtained. Complete extermination resulted in one test with 1 ounce doses. In the remaining five tests where doses of ¾ to 1 ounce were used, the effectiveness varied from 90 to 99 per cent. The killing power of the chemical in open burrows in an important factor, since the closing of burrows involves considerable time and labor. Preliminary tests by Professor F. L. Hisaw, Kansas State Agricultural College, indicate that calcium cyanide might be effectively used in the eradication of the pocket gopher, Geomys bursarius (Shaw). Doses of 1 and 2 ounces were used. The dose was placed in the main run through an opening made with a trowel. After dosing the holes were closed. Effectiveness varied from 88 to 94 per cent.
Databáze:	OpenAIRE
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