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The Evaluation of Pyrethrum Flowers (Chrysanthemum Cinerariaefolium)

Published online by Cambridge University Press:  27 March 2009

J. T. Martin  and
F. Tattersfield
J. T. Martin
Affiliation:
(Department of Insecticides and Fungicides, Rothamsted Experimental Station, Harpenden.)
F. Tattersfield
Affiliation:
(Department of Insecticides and Fungicides, Rothamsted Experimental Station, Harpenden.)
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Extract

1. The analytical methods of Tattersfield, Hobson and Gimingham(6) and Gnadinger and Corl(1) for the determination of the pyrethrins in pyrethrum flowers are compared, and certain modifications in technique suggested.

2. Good concordances have been obtained between analytical data and insecticidal tests employing Aphis rumicis.

3. A new method for the rapid and approximate evaluation of unadulterated samples, employing small quantities of material, is described.

4. Observations on the pyrethrin content of individual flowers in the various stages of development are recorded, making use of a modification of the method indicated under (3).

Type
Research Article
Information
The Journal of Agricultural Science , Volume 21 , Issue 1 , January 1931 , pp. 115 - 135
Copyright
Copyright © Cambridge University Press 1931

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References

REFERENCES

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