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DEVELOPMENT OF DDT RESISTANCE IN CERTAIN MAYFLIES IN NEW BRUNSWICK

Published online by Cambridge University Press:  31 May 2012

C. D. Grant  and
A. W. A. Brown
C. D. Grant
Affiliation:
Department of Zoology, University of Western Ontario, London, Ontario
A. W. A. Brown
Affiliation:
Department of Zoology, University of Western Ontario, London, Ontario
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Abstract

Populations of the mayfly Heptagenia hebe McDunnough in areas of New Brunswick air-sprayed with DDT for budworm control for eight successive years, when tested as nymphs taken from the streams, showed LC50 levels 3 times as high as those in untreated areas. Populations surviving an airspray in 1965 proved to be 12 to 40 times as DDT-resistant as the normal. Pre-spray populations of Stenonema fuscum (Clemens) showed a 5-fold resistance, and post-spray populations of Stenonema interpunctatum (Say) showed a 10-fold DDT resistance when those from treated areas were compared with those from untreated. The DDT-resistant nymphs of H. hebe detoxified DDT to DDE 15 times faster than the normal nymphs; DDE was also the metabolite in S. interpunctatum. In both these species the DDT-resistant nymphs absorbed roughly twice as much DDT as the normal.

Type
Articles
Information
The Canadian Entomologist , Volume 99 , Issue 10 , October 1967 , pp. 1040 - 1050
Copyright
Copyright © Entomological Society of Canada 1967

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