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Studies on Aqueous Suspensions of Insecticides. Part II. Quantitative Determinations of Weights of DDT picked up and retained

Published online by Cambridge University Press:  10 July 2009

F. Barlow
Affiliation:
Colonial Insecticides Research Unit, Porton.
A. B. Hadaway
Affiliation:
Colonial Insecticides Research Unit, Porton.

Extract

The weights of insecticide picked up by mosquitos and tsetse flies in short contact periods on deposits from aqueous suspensions of DDT crystals of different sizes have been determined chemically and correlated with corresponding mortality rates.

The rate of action of DDT particles picked up by mosquitos increases as the size decreases.

Taking into account the weights of insecticide picked up, the median lethal dosage increases as the particle size increases. A further factor, that of retention on the body of the insects, has to be considered, however, for there is evidence that adherence of particles in the 0–10 and 10–20 micron ranges is greater than that of larger particles. Availability, and therefore effectiveness, of deposits from aqueous suspensions of insecticide particles is influenced considerably by the type of material to which they are applied.

Type
Original Articles
Copyright
Copyright © Cambridge University Press 1952

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References

Alexander, P., Kitchener, J. A. & Briscoe, H. V. A. (1944). Ann. appl. Biol., 31, pp. 150156.CrossRefGoogle Scholar
Hadaway, A. B. & Barlow, F. (1951). Bull. ent. Res., 41, pp. 603622.CrossRefGoogle Scholar
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Prickett, C. S., Kunze, F. M. & Laug, E. P. (1950). J. Ass. off. agric. Chem., 33, pp. 880886.Google Scholar
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