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The Deposition of Airborne Droplets on dead House-flies (Musca domestica L.)

Published online by Cambridge University Press:  10 July 2009

R. T. Jarman
R. T. Jarman
Affiliation:
Chesterford Park Research Station, nr. Saffron. Walden, Essex.
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Extract

An experimental laboratory study of the deposition of droplets on dead house-flies (Musca domestica L.) was made, using a spinning-top sprayer to produce a spray of uniformly sized oil droplets and a cascade impactor to measure the concentration of the spray of droplets, which were dyed. The deposits obtained on a dead house-fly and a cascade-impactor slide when these were exposed in turn to a wind of 1 m. per sec. in a wind tunnel were compared colorimetrically, and determinations thus made of the collection efficiency of the flies, defined as the volume of liquid deposited on an object expressed as a percentage of the volume that would have passed through the same cross-section as the object had that not been there.

The measured collecting efficiency of a fly varied from about 70 per cent. (droplet dia. 27μ) to about 200 per cent. (droplet dia. 75μ), and was approximately twice that of a sphere with a cross-sectional area twice the projected frontal area of the fly. From theoretical calculations of the filtering effect of different elements of the vegetation, it is concluded that the optimum droplet diameter for deposition on flies in woodland is 20–40μ.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 50 , Issue 2 , August 1959 , pp. 327 - 332
Copyright
Copyright © Cambridge University Press 1959

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References

Green, H. L. & Lane, W. R. (1957). Particulate clouds: dusts, smokes and mists.—425 pp. London, Spon.Google Scholar
Gregory, P. H. (1951). Deposition of air-borne Lycopodium spores on cylinders.—Ann. appl. Biol. 38 pp. 357–376.CrossRefGoogle Scholar
Jarman, R. T. (1959). The deposition of wind-borne oil droplets on spheres.—J. agric. Engng Res. 4 (in press).Google Scholar
La Mer, V. K. & Hochberg, S. (1949). The laws of deposition and the effective ness of insecticidal aerosols.—Chem. Rev. 44 pp. 341–352.CrossRefGoogle Scholar
Langmuir, I. & Blodgett, K. B. (1945). Mathematical investigation of water droplet trajectories.—Gen. Elect. Res. Lab. Rep. no. R.L. 225. Schenectady, N.Y.Google Scholar
Latta, R. & Others (1947). The effect of particle size and velocity of movement of DDT aerosols in a wind tunnel on the mortality of mosquitoes.—J. Wash. Acad. Sci. 37 pp. 397–407.Google Scholar
May, K. R. (1945). The cascade impactor: an instrument for sampling coarse aerosols.—J. sci. lustrum. 22 pp. 187–195.Google Scholar
May, K. R. (1949). An improved spinning top homogeneous sprayer.—J. appl. Phys. 20 p. 932.CrossRefGoogle Scholar
May, K. R. (1950). The measurement of airborne droplets by the magnesium oxide method.—J. sci. Instrum. 27 p. 128.CrossRefGoogle Scholar
May, K. R. (1956). A cascade impactor with moving slides.—A.M.A. Arch. industr. Hlth 13 pp. 481–488.Google ScholarPubMed
Ranz, W. E. & Wong, J. B. (1952). Impaction of dust and smoke particles on surface and body collectors.—Industr. Engng Chem. 44 pp. 1371–1380.CrossRefGoogle Scholar
Simmons, L. F. G. (1949). A shielded hot-wire anemometer for low speeds.—J. sci. Instrum. 26 p. 407.CrossRefGoogle Scholar
Thompson, B. W. (1953). Aircraft applications of insecticides in East Africa. III. Atmospheric turbulence in woodland.—Bull. ent. Res. 44 pp. 611–626.CrossRefGoogle Scholar
Wootten, N. W. & Sawyer, K. F. (1954). The pick-up of spray droplets by flying locusts.—Bull. ent. Res. 45 pp. 177–197.CrossRefGoogle Scholar