Hostname: page-component-848d4c4894-xm8r8 Total loading time: 0 Render date: 2024-07-03T15:41:09.931Z Has data issue: false hasContentIssue false
  • English
  • Français

Insecticidal operations against Chironomid midges along the Blue Nile.

Published online by Cambridge University Press:  10 July 2009

A. W. A. Brown ,
D. J. Mckinley ,
H. W. Bedford  and
M. Qutubuddin
Get access Rights & Permissions [Opens in a new window]

Extract

In 1956 and 1957, tests were made in the Sudan Eepublic of four methods of applying insecticides for the control of heavy infestations of midges, particularly Tanytarsus lewisi Freeman, which breed in the Blue Nile. During the winter season the adults occur in myriads in areas adjacent to the river in Khartoum and similar localities, resting in trees and shrubs by day and being attracted to artificial lights after dusk

An emulsion containing 0·4 per cent. DDT applied from the ground to shadetrees in Khartoum at the rate of 0·5·1·0 lb. DDT per tree achieved local control of the midges for three days and detectable reduction for 10 days. An emulsion containing 12·5 per cent. DDT applied from an aircraft to the wooded riverfrontage at Khartoum at 2·1 lb. per acre reduced the numbers of adult midges for the next 15 days, but subsequent applications under conditions of greater air turbulence were ineffective.

The application of DDT as a larvicide in oil solution from aircraft to the river 10 miles above Khartoum, at a concentration approximately equivalent to 0·1 p.p.m. in 2 hours' riverflow, did not appear to reduce the numbers of adults or immature stages at Khartoum, and was followed by some mortality of fish.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 51 , Issue 4 , January 1961 , pp. 789 - 802
Copyright
Copyright © Cambridge University Press 1961

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

Arnason, A. P., Brown, A. W. A., Fredeen, F. J. H., Hopewell, W. W. & Rempel, J. G. (1949). Experiments in the control of Simulium arcticum Malloch by means of DDT in the Saskatchewan river.—Sci. Agric. 29 pp. 527–537.Google Scholar
Burden, E. H. W. J. (1956). A case of DDT poisoning in fish.—Nature, Lond. 178 pp. 546–547.CrossRefGoogle ScholarPubMed
Grindley, D. N. (1952). The composition of the body fat of small green Chironomids.—J. exp. Biol. 29 pp. 440–444.CrossRefGoogle Scholar
Lewis, D. J. (1957). Observations on Chironomidae at Khartoum.—Bull. ent. Res. 48 pp. 155–184.CrossRefGoogle Scholar
Lewis, D. J., Henry, A. J. & Grindley, D. N. (1954). Daily changes in the numbers of Chironomid midges at Khartoum.—Proc. R. ent. Soc. Lond. (A) 29 pp. 124–128.Google Scholar
Lindquist, A. W., Roth, A. R. & Walker, J. R. (1951). Control of the Clear Lake gnat in California.—J. econ. Ent. 44 pp. 572–577.CrossRefGoogle Scholar