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Resistance to Cyclodiene Insecticides in Root Maggots Infesting Tobacco

Published online by Cambridge University Press:  31 May 2012

J. N. Telford  and
A. W. A. Brown
J. N. Telford
Affiliation:
Department of Zoology, University of Western Ontario, London
A. W. A. Brown
Affiliation:
Department of Zoology, University of Western Ontario, London
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Abstract

A study was made of the resistance to cyclodiene insecticides in the root maggots H. cilicrura and H. liturata infesting tobacco in southwestern Ontario; the resistance tests were made with dieldrin by the WHO impregnated-paper method. Field-collected adults classifiable as H. liturata showed a dieldrin-resistance which did not extend to DDT; the few F1 offspring obtainable by laboratory rearing were highly dieldrin-resistant. A strain of H. cilicrura originating from a collection of both species made at Delhi in 1960, and considered at the time to be dieldrin-resistant, proved to be just as susceptible to dieldrin as the Chatham laboratory strain. Individuals of H. cilicrura admixed with dieldrin-resistant H. liturata in a collection made at St. Thomas in August 1962 were all susceptible. The hypothesis is offered that the reversal in the proportions of the two species on tobacco in recent years is partly due to a difference between them in that H. liturata is capable of cyclodiene-resistance whereas H. cilicrura is not.

Type
Articles
Information
The Canadian Entomologist , Volume 96 , Issue 5 , May 1964 , pp. 758 - 764
Copyright
Copyright © Entomological Society of Canada 1964

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