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The Residual Toxicity of Some Newer Acaricides to the Two-Spotted Spider Mite (Acarina: Tetranychidae)1

Published online by Cambridge University Press:  31 May 2012

Thomas Armstrong
Thomas Armstrong
Affiliation:
Dominion Entomological Laboratory, Vineland Station, Ont.
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Extract

The data presented in this paper were obtained during preliminary tests of acaricides that have been carried on in the greenhouse since 1947. Special attention has been given to the duration of residual action because this is one of the most critical indications of the potential value of an acaricide under field conditions. Residual toxicity in these experiments may he defined as the toxicity of a dry deposit to mites introduced on foliage subsequent to spraying.

The modes of action of the various acaricides are uncertain. In most cases it is undoubtedly contact action, although the more volatile materials may have some fumigant effect. Toxicity by direct ingestion is unlikely because of the feeding habits of the mites, but it is possible that some of the compounds tested may have a systemic action, being absorbed by the plant and remaining within the tissues for an extended period.

Type
Articles
Information
The Canadian Entomologist , Volume 82 , Issue 4 , April 1950 , pp. 73 - 83
Copyright
Copyright © Entomological Society of Canada 1950

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References

1 Contribution No. 2651, Division of Entomology, Science Service, Department of Agriculture, Ottawa, Canada.