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THE EFFECT ON THE TWO-SPOTTED SPIDER MITE, TETRANYCHUS URTICAE, OF DICOFOL CONCENTRATION AND DEPOSIT DISTRIBUTION ON THE LEAF SURFACE1

Published online by Cambridge University Press:  31 May 2012

R. W. Fisher  and
N. G. Morgan
R. W. Fisher
Affiliation:
Research Station, Canada Department of Agriculture, Vineland Station, Ontario
N. G. Morgan
Affiliation:
Department of Entomology, Long Ashton Research Station, University of Bristol, Long Ashton, Somerset, England
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Abstract

Dicofol was applied to bean leaf discs in various ways. The number of drops per disc, the concentration of dicofol in each drop, and the size of the drops were related to egg laying and mortality of adult female mites placed on the discs. Under the conditions of the experiment, an increase in concentration above normal field strength (0.046% active ingredient) had little effect, even though the deposits were discontinuous and similar to those expected from low-volume spraying. Repellency of dicofol to mites was reaffirmed and toxicity effects were significant when about one-quarter of the leaf surface was covered by deposit.

Type
Articles
Information
The Canadian Entomologist , Volume 100 , Issue 7 , July 1968 , pp. 777 - 781
Copyright
Copyright © Entomological Society of Canada 1968

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References

Morgan, N. G. 1953. Spray application problems VI. A laboratory technique, using Botrytis fabae on broad bean, for the biological evaluation of spray deposits. Rep. Long Ashton Res. Stn for 1952. pp. 99–102.Google Scholar
Fisher, R. W., and Hansell, R. I. C.. 1964. Effect of pre- and post-treatment temperatures, age of deposit, and repellency on the toxicity of Kelthane to the two-spotted mite, Tetranychus telarius (L.) (Acarina: Tetranychidae). Can. Ent. 96: 1307–1312.CrossRefGoogle Scholar