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DIEL PERIODICITY IN SENSITIVITY OF TETRANYCHUS URTICAE (ACARINA: TETRANYCHIDAE) TO DICOFOL1

Published online by Cambridge University Press:  31 May 2012

R. W. Fisher
R. W. Fisher
Affiliation:
Research Station, Canada Department of Agriculture, Vineland Station, Ontario
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Abstract

The two-spotted spider mite, Tetranychus urticae Koch, showed a pronounced two-peak diel periodicity of susceptibility to dicofol, in a natural regimen of light: dark. The first occurred between 0200 and 0500 hours and the second between 1300 and 1800 hours. Mortality dropped sharply after sunrise (0441 hours) and again an hour before sunset (2002 hours). Lowest mortality occurred near midday. Egg-laying was inversely related to mortality over the 24-hour period.

Type
Articles
Information
The Canadian Entomologist , Volume 99 , Issue 3 , March 1967 , pp. 281 - 284
Copyright
Copyright © Entomological Society of Canada 1967

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References

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