*Editors' Note—Recent work on the use of pyrethrum-in-oil insecticides emphasized the need for satis factory means for their evaluation and standardization. Chemical determination of the content of pyrethrins may not by itself always give a reliable measure of toxicity, and a standard biological method of evaluation is essential. Early in 1941. discussions between representatives of research laboratories and industrial firms interested resulted in the formation of a small committee under the chairmanship of Dr F. Tattersfield to consider the best means of dealing with this problem. As a result of the work of this committee, it was agreed that the Pest Infestation Laboratory of the Department of Scientific and Industrial Research should investigate the development of a standard method of biological evaluation employing a film technique and that the Department of
Biological methods of determining the insecticidal values of pyrethrum preparations (particularly extracts in heavy oil)*
Version of Record online: 26 FEB 2008
Annals of Applied Biology
Volume 30, Issue 3, pages 259–279, November 1943
How to Cite
Tattersfield, F. and Potter, C. (1943), Biological methods of determining the insecticidal values of pyrethrum preparations (particularly extracts in heavy oil). Annals of Applied Biology, 30: 259–279. doi: 10.1111/j.1744-7348.1943.tb06197.x
- Issue online: 26 FEB 2008
- Version of Record online: 26 FEB 2008
- Received 28 November 1942
Pyrethrum extracts in non-volatile oil carriers are effective insecticides in the field because they act as a direct spray killing the insect and also form a toxic film over which the insect crawls: it is necessary to study both these effects for a complete laboratory assessment of toxicity. Suitable laboratory techniques and methods for the assessment of results are described together with an account of experiments on the effect of various factors on the insecticidal efficiency of pyrethrum-in-oil preparations, both as direct sprays and as toxic films.
The programme necessitated some duplication of work, but discussions that took place from time to time between the workers concerned at the two laboratories during the progress of the investigations reduced this to a minimum.