Vernon H. Lee

Document Type

Thesis - Open Access

Award Date


Degree Name

Master of Science (MS)

Department / School



Entomologists and geneticists have been interested in the resistance shown by houseflies, Musca domestica L., to DDT. The widespread use of this insecticide immediately following the Second World War, and the subsequent wide-spread resistance to its effect by several species of insects has stimulated much research involving the chemical and genetic roles in resistance. In 1950 and 1951, attention was called to the poor control of houseflies achieved by DDT at Brookings, South Dakota. Study results indicated a very high level of resistance. In 1954, further testing for resistance was done. Having knowledge of the level of resistance in the city of Brookings, particularly of the fly populations at South Dakota State College, located at Brookings, several questions arose: (1) Are fly populations in areas rural to Brookings also resistant to DDT? (2) If so, what is the level of resistance as compared to the Brookings strain? (3) Are there small areas of high resistance in a large area of general normal susceptibility, or are there small areas of susceptibility in large areas of general high resistance? If neither condition is the case, then are there enclaves of resistant and susceptible populations in an area of resistance or a level somewhere intermediate to high resistance and susceptibility?

Library of Congress Subject Headings

Flies -- Control


Includes bibliographical references (page 35)



Number of Pages



South Dakota State University


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