Hostname: page-component-78c5997874-8bhkd Total loading time: 0 Render date: 2024-11-18T10:28:11.751Z Has data issue: false hasContentIssue false
  • English
  • Français

Experiments in the Use of Insecticides for the Protection of Grain in Storage

Published online by Cambridge University Press:  10 July 2009

R. Le Pelley  and
S. Kockum
R. Le Pelley
Affiliation:
Department of Agriculture, Kenya.
S. Kockum
Affiliation:
Department of Agriculture, Kenya.
Get access Rights & Permissions [Opens in a new window]

Extract

Five experiments in the use of insecticides against Calandra oryzae (L.) in stored maize are described. The results with statistical analysis and deductions are given. The insecticides used were BHC, DDT, pyrethrum, pyrethrin-piperonyl butoxide mixtures; the diluting dusts used were a local diatomite, a local bentonitic clay, and a local soapstone.

Among the chief conclusions are the following:—

The insect damage in conditioned grain did not reach, throughout an eight-month period, the high level which it did in unconditioned grain, the conditioning process alone therefore is a valuable treatment for insect control.

Bentonite alone is not a protectant and its addition to grain may on the contrary provide a more favourable environment for Calandra.

A Kenya soapstone (from Kisii) is not an effective protectant but had some effect in reducing Calandra populations over the period when an initial increase was occurring in control bags.

Kenya diatomite is a protectant. It reduces the percentage of grain damaged, but when used in bagged grain this is not proved to be due solely to intrinsic toxicity, but may in fact be due chiefly to the slippery nature of the material inhibiting insect distribution through the bulk of grain.

Gamma BHC at 1 p.p.m. is completely effective for 16 months.

Gamma BHC at 0.5 p.p.m. has some protectant effect but is not fully effective.

DDT at 7 p.p.m. has not a protectant effect.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 45 , Issue 2 , June 1954 , pp. 295 - 311
Copyright
Copyright © Cambridge University Press 1954

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

Anon. (1945). Recent analyses and tests of a Kenya diatomite.—Bull. imp. Inst., 43, pp. 55–58.Google Scholar
Beckley, V. A. (1948). Protection of grain against weevils.—E. Afr. agric. J., 14, pp. 71–76.Google Scholar
Darling, H. S. (1947). Report of the Entomologist.—Rep. Dep. Agric. Uganda, 1945–46, pt. 2 pp. 16–30.Google Scholar
Davies, O. L. (1947). Statistical methods in research and production.—p. 116. Edinburgh, Oliver & Boyd.Google Scholar
Fisher, R. A. & Yates, F. (1948). Statistical tables for biological, agricultural and medical research.—3rd edn., p. 56. Edinburgh, Oliver & Boyd.Google Scholar
Harris, W. V. (1938). Annual report of the Entomologist for the year 1937.—Ent. Leafl. Dep. Agric. Tanganyika, no. 16, 8 pp.Google Scholar
Harris, W. V. (1950). Report of the Senior Entomologist.—Rep. Dep. Agric. Uganda, 1947–48, pt. 2 pp. 1–5.Google Scholar
Howe, R. W. (1952). Experiments on the use of pyrethrum powder as an admixed dust in the tropics.—Pyrethrum Post, 2, no. 4 pp. 4–6.Google Scholar
Howe, R. W. & Oxley, T. A. (1944). The use of carbon dioxide production as a measure of infestation of grain by insects.—Bull. ent. Res., 35, pp. 11–22.CrossRefGoogle Scholar
Michelmore, A. P. G. (1952). Section of Entomology. General progress report.—Rec. Invest. Dep. Agric. Uganda, 1949–50, pp. 4–22.Google Scholar
Parkin, E. A. (1951). A laboratory test of pyrethrum powder to protect grain against infestation by weevil.—Pyrethrum Post, 2, no. 3 pp. 11–14.Google Scholar
Pulfrey, W. (1946). The nature and origin of soapstone from near Kisii.—J. E. Afr. nat. Hist. Soc., 19, p. 51.Google Scholar
Pulfrey, W. (1947). The geology and mineral resources of Kenya.—Bull. imp. Inst., 45, pp. 277–299.Google Scholar
Swaine, G. (1952). 1950 Annual report of the Entomologist, Morogoro.—Rep. Dep. Agric. Tanganyika, 1950, pp. 175–178.Google Scholar
Volterra, V. (1931). Variations and fluctuations of the number of individuals in animal species living together.—In Chapman, R.N. Animal ecology, pp. 409–448. New York, McGraw-Hill.Google Scholar