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An Apparatus for testing the Toxic Values of Contact Insecticides under Controlled Conditions

Published online by Cambridge University Press:  10 July 2009

F. Tattersfield  and
H. M. Morris
F. Tattersfield
Affiliation:
(Department of Insecticides and Fungicides)
H. M. Morris
Affiliation:
(Department of Entomology), Rothamsted Experimental Station.
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Extract

An apparatus for determining the relative toxicities of contact insecticides is described in detail. It is so arranged that successive batches of insects are sprayed under conditions as similar as possible, so that on using various substances at different concentrations, the results are directly comparable.

The apparatus consists of a glass jar in the lid of which an atomiser is fixed. By means of compressed air at known pressure the atomiser throws a constant quantity of fine spray upon insects placed in a dish inside the jar. Photographs illustrating the details of the apparatus are given.

The method used in practice for the spraying of aphides in this apparatus is described, and examples are given in the form of a table and a graph of the type of results obtained when different concentrations of nicotine are sprayed upon apterous agamic females of A. rumicis.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 14 , Issue 3 , March 1924 , pp. 223 - 233
Copyright
Copyright © Cambridge University Press 1924

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References

* This nozzle was designed for us by Mr. Leopold Ward, 2–3, Duke Street, S.W. 1. The apparatus was constructed to our design by Messrs. Pellant, Harpenden.

† This plate has a central perforation 2 cm. in diameter by means of which it can be readily placed in position.