Abstract
EXPERIMENTAL work during the past two years has shown that the period of protection against sheep blowfly strike conferred by aldrin and dieldrin dips can vary from 12 to more than 40 weeks. In Britain sheep dipped in May with dieldrin at a concentration of 0.05 per cent are usually protected against strike for a period of up to 16 weeks. Aldrin is not so widely used in sheep dips, but its protective period at the same concentration is about 12–14 weeks. It has been found, however, that if sheep are dipped in aldrin in August sufficient insecticide remains to prevent strike until April or May of the following year—a period of approximately 40 weeks. Little is known about the rate of depletion of insecticide or the factors that bring it about, and the present work was designed to throw some light on this problem.
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References
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Fiedler, G. H., and Du Toit, R., Nature, 168, 608 (1951).
Lipson, M., and Hope, R. J., “Mothproofing of Wool”, International Wool Textile Research Conference, Australia, 1955 (Proceedings).
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HARRISON, I., JOHNSON, C. Persistence of Aldrin and Dieldrin Residues in Sheep Fleece. Nature 181, 1267–1268 (1958). https://doi.org/10.1038/1811267a0
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DOI: https://doi.org/10.1038/1811267a0
