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Dissimilarity of Heptachlor-resistance in Life-stages of the Turnip Maggot, Hylemya floralis (Fall.) (Diptera: Anthomycidae)1

Published online by Cambridge University Press:  31 May 2012

W. W. A. Stewart  and
K. S. McKinlay
W. W. A. Stewart
Affiliation:
Research Station, Canada Department of Agriculture, Saskatoon, Saskatchewan
K. S. McKinlay
Affiliation:
Research Station, Canada Department of Agriculture, Saskatoon, Saskatchewan
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Abstract

Laboratory tests of heptachlor-resistance in larvae and adults from treated and untreated farm populations of Hylemya floralis (Fall.) showed that only larvae were developing resistance. Therefore it is suggested that all life-stages of insect pests should be tested to determine which stage soonest reflects the highest level of resistance. This stage could be used to detect levels of resistance in the field and to permit alteration of control programs, to prevent development of complete resistance and the consequent loss of crop.

Third-instar larvae from the farm where all cruciferous crops had been treated with heptachlor annually, from 1952 to 1961, were resistant to 80 times greater concentrations of heptachlor than those from the untreated farm. From 1962 to 1964 the level of resistance remained constant in third-instar larvae from the untreated farm but it decreased fivefold in those from the treated farm. This decreased resistance is attributed to dilution of the population by non-resistant H. floralis from adjoining crops untreated during this period.

Type
Articles
Information
The Canadian Entomologist , Volume 97 , Issue 11 , November 1965 , pp. 1166 - 1170
Copyright
Copyright © Entomological Society of Canada 1965

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References

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