Abstract
VARIOUS substances activate certain insecticides, especially the pyrethrins; that is to say, these substances, though themselves non-toxic, intensify the toxic action of pyrethrins or other insecticides upon insects. However, no attempt seems to have been made up to now to compare activation effects quantitatively. Many methylenedioxyphenyl compounds are good activators, and two preparations containing them have been investigated, namely, (A) one containing 80 per cent of (3,4-methylenedioxy-6-propyl benzyl) (butyl) diethylene glycol ether and 20 per cent of related compounds, and (B) one containing the n-octyl sulphoxide of isosafrole. Both these materials were found to activate pyrethrins, allethrin, and γ-benzene hexachloride (BHC) against flour beetles, Tribolium castaneum1. The relationship between mortality and the concentrations of insecticide and activator has been investigated, using the materials in solution in Shell oil P31 (with benzene as an intermediate solvent where necessary): the solutions were applied at fixed deposit by means of a direct spray technique2. In addition, an effort has been made to compare quantitatively the intensities with which the two activators activate each insecticide, and with which the different insecticides are activated by each activator.
This is a preview of subscription content, access via your institution
Access options
Subscribe to this journal
Receive 51 print issues and online access
$199.00 per year
only $3.90 per issue
Buy this article
- Purchase on Springer Link
- Instant access to full article PDF
Prices may be subject to local taxes which are calculated during checkout
Similar content being viewed by others
References
Hewlett, P. S., Bull. Ent. Res., 43, 21 (1952).
Hewlett, P. S., Ann. App. Biol., 34, 357 (1947).
Finney, D. J., Supp. J. Roy. Statist. Soc., 9, 46 (1947).
Wilson, C. S., J. Econ. Ent., 42, 423 (1949).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
HEWLETT, P. Comparisons of Insecticidal Activation. Nature 169, 844–845 (1952). https://doi.org/10.1038/169844b0
Issue Date:
DOI: https://doi.org/10.1038/169844b0
Comments
By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.