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MORTALITY OF THE EUROPEAN RED MITE (ACARINA: TETRANYCHIDAE) RELATIVE TO DISTRIBUTION AND DEGRADATION OF DICOFOL DEPOSITS ON PEACH LEAVES

Published online by Cambridge University Press:  31 May 2012

D. C. Herne  and
Mikio Chiba
D. C. Herne
Affiliation:
Research Station, Canada Department of Agriculture, Vineland Station, Ontario
Mikio Chiba
Affiliation:
Research Station, Canada Department of Agriculture, Vineland Station, Ontario
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Abstract

Mortality of the European red mite, Panonychus ulmi (Koch), on peach leaves was directly related to the uniformity of distribution and amount of deposit of dicofol for up to 4 days after the spray was applied. Mite mortality decreased rapidly from the 4th to the 11th day after spraying, whereas the dicofol detected by chemical analysis decreased at a slower rate. The minimum deposit of dicofol for 100% kill of the mite, immediately after spraying, was between 0.3 and 0.8 μg/cm2, depending upon uniformity of coverage. Doubling the dose did not increase the mortality then or later. Fourteen days after spraying, the dicofol deposit on some leaves was still 0.7–0.8 μg/cm2 but there was practically no mite mortality.

Type
Articles
Information
The Canadian Entomologist , Volume 107 , Issue 8 , August 1975 , pp. 801 - 806
Copyright
Copyright © Entomological Society of Canada 1975

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