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The collection of spray droplets by flying locusts

Published online by Cambridge University Press:  10 July 2009

R. D. MacCuaig
R. D. MacCuaig
Affiliation:
Anti-Locust Research Centre
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Extract

An account is given of work carried out since that of Wootten & Sawyer (1954) on the pick-up of spray droplets by flying locusts. The same species, Schistocerca gregaria (Forsk.), was used. The values given in their work for the amounts of spray collected were confirmed, but when observations were extended to cover smaller droplets (less than 50-μ. diameter), locusts were found to collect these much less efficiently.

Other factors affecting pick-up were sex (females collected more spray than males) and flying speed (faster-flying locusts tended to collect less spray per unit of distance flown). When the angle of approach of the droplets to the flying locusts was varied between 1 and 11° from the horizontal no difference in the pick-up of spray could be detected.

For droplets between 60- and 300-μ diameter, the dose of insecticide collected by the locusts is given by the formula 9xPC μg. for males, and 11·5xPC for females, when the locusts fly through a concentration of spray of C ml. per cu. m. for a distance P m. and the spray solution contains x per cent, (w/v) of insecticide.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 53 , Issue 1 , May 1962 , pp. 111 - 123
Copyright
Copyright © Cambridge University Press 1962

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References

Hopf, H. S. (1951). The toxicity of certain contact insecticides to the African migratory locust.—Proc. IInd int. Congr. Crop. Prot. 1949 pp. 213–220.Google Scholar
Jarman, R. T. (1958). The deposition of wind-borne oil droplets on various horizontal surfaces.—J. agric. Engng Res. 3 pp. 131–136.Google Scholar
Jarman, R. T. (1959). The deposition of wind-borne oil droplets on spheres.—J. agric. Engng Res. 4 pp. 139–143.Google Scholar
La Mer, V. K. & Hochberg, S. (1949). The laws of deposition and the effectiveness of insecticidal aerosols.—Chem. Rev. 44 pp. 341–352.Google Scholar
Lane, W. R. (1947). A microburette for producing small liquid drops of known size.—J. sci. Instrum. 24 pp. 98–101.CrossRefGoogle Scholar
Langmuir, I. & Blodgett, K. B. (1945). Mathematical investigation of water droplet trajectories.—Gen. Elect. Res. Lab. Rep. no. E.L.225. Schenectady, N.Y.Google Scholar
MacCuaig, R. D. (1958a). Spray-collecting area of locusts and their susceptibility to insecticides.—Nature, Lond. 182 pp. 478–479.Google Scholar
MacCuaig, R. D. (1958b). The toxicity of insecticides to adult locusts.—J. Sci. Fd Agric. 9 pp. 330–342.CrossRefGoogle Scholar
May, K. R. (1945). The cascade impactor: an instrument for sampling coarse aerosols.—J. sci. Instrum. 22 pp. 187–195.Google Scholar
Miller, P. L. (1960). Respiration in the desert locust. I–III.—J. exp. Biol. 37 pp. 224–278.CrossRefGoogle Scholar
Sawyer, K. F. (1950). Aerial curtain spraying for locust control: a theoretical treatment of some of the factors involved.—Bull. ent. Res. 41 pp. 439–457.Google Scholar
Townsend, A. A. (1948). Theoretical effects of drop size on the collection of spray by flying insects.—Anti-Locust Bull. no. 2 pp. 62–64.Google Scholar
Weis-Fogh, T. (1956). Biology and physics of locust flight. II.—Phil. Trans. (B) 239 pp. 459–510.Google 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