Hostname: page-component-586b7cd67f-dlnhk Total loading time: 0 Render date: 2024-11-29T11:15:49.104Z Has data issue: false hasContentIssue false
  • English
  • Français

Factors influencing the Interaction of insecticidal Mists on flying Insects

Part III. Biological Factors

Published online by Cambridge University Press:  10 July 2009

W. A. L. David  and
P. Bracey
W. A. L. David
Affiliation:
(Entomology Department, London School of Hygiene and Tropical Medicine.)
P. Bracey
Affiliation:
(Entomology Department, London School of Hygiene and Tropical Medicine.)
Get access Rights & Permissions [Opens in a new window]

Extract

Experiments are described which illustrate some of the ways in which the results of exposing insects to a spray mist are dependent on either their behaviour or physiological state. Only fine mist dispersals with particles below 10 microns in diameter are considered and in such mists the flight movements of the insects are very largely responsible for the collisions between the insect and the droplets. An increase in flight activity leads to the accumulation of a greater number of spray droplets and consequently a higher kill. Under these conditions insecticides such as pyrethrins which exert a strong irritating action on Aëdes in minimal amounts are superior to DDT which does not have this effect. For practical applications under circumstances where the sprays depend on mist action to produce their effect it is advantageous to mix pyrethrum with the DDT sprays so that the maximum dose of the latter may be accumulated.

Further experiments are concerned with the relative resistance of male and female Aëdes aegypti to insecticides and the change of resistance which takes place on ageing or as a result of a blood meal. It is shown that the male is innately more susceptible to both pyrethrins and DDT and that the resistance of the females is higher after a blood meal. There is also a progressive decrease in resistance with age.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 37 , Issue 2 , September 1946 , pp. 177 - 190
Copyright
Copyright © Cambridge University Press 1946

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

Bliss, C. I. (1938). The transformation of percentages for use in the analysis of variance.—Ohio J. Sci., 38, pp. 9–12.Google Scholar
Buxton, P. A. & Hopkins, G. H. E. (1927). Researches in Polynesia and Melanesia.—Mem. Lond. Sch. Hyg. Trop. Med., No. 1.Google Scholar
David, W. A. L. (1946a) Factors influencing the interaction of insecticidal mists and flying insects. Part I. The design of a spray testing chamber and some of its properties.—Bull. ent. Res., 36, pp. 373–393.Google Scholar
David, W. A. L. (1946b) Factors influencing the interaction of insecticidal mists and flying insects. Part II. The production and behaviour of kerosene base insecticidal spray mists and their relation to flying insects.—Bull. ent. Res., 37, pp. 1–28.Google Scholar
David, W. A. L. & Bracey, P. (1944). Activation of pyrethrins in fly sprays.—Nature, 153, p. 594.CrossRefGoogle Scholar
David, W. A. L., Bracey, P. & Harvey, A. (1944). Equipment and method employed in breeding Aëdes aegypti, L., for the biological assay of insecticides.—Bull. ent. Res., 35, 227–230.Google Scholar
Grady, A. G. (1928). Studies in breeding insects throughout the year for insecticide tests. I. House flies, Musca domestica.—J. econ. Ent., 21, pp. 598–612.Google Scholar
Lord, F. T. (1942). The relative susceptibility of the sexes of Drosophila melanogaster Meigh. to nicotine (alkaloid) used as contact insecticide.—72nd Rep. ent. Soc. Ont., 1941, pp. 32–34.Google Scholar
Miller, A. C. & Simanton, W. A. (1938). Biological factors in Peet-Grady results.—Soap, 14, no. 5, pp. 103–113.Google Scholar
Murray, C. A. (1937). A statistical analysis of fly mortality data.—Soap, 13, no. 8, pp. 89–105.Google Scholar
Murray, C. A. (1938). Dosage-mortality in the Peet-Grady method.—Soap, 14, no. 2, p. 99.Google Scholar
Simanton, W. A. & Miller, A. C. (1937). Housefly age as a factor in susceptibility to pyrethrum sprays.—J. econ. Ent., 30, pp. 917–921.CrossRefGoogle Scholar
Tuma, V. (1938). Roaches. A study of the relationship between the ages of cockroaches and their resistance to insecticides.—Soap, 14, no. 6, p. 109.Google Scholar