Hostname: page-component-cd9895bd7-mkpzs Total loading time: 0 Render date: 2024-12-22T18:25:11.391Z Has data issue: false hasContentIssue false
  • English
  • Français

Observations on the effect of DDT formulations on the yellow tea mite, Hemitarsonemus latus (Banks), in Uganda

Published online by Cambridge University Press:  10 July 2009

J. C. Davies
J. C. Davies
Affiliation:
Department of Agriculture, Uganda.
Get access Rights & Permissions [Opens in a new window]

Extract

The effect of DDT applied to cotton plants four times at 10-day intervals at a rate of 1 lb. active ingredient per acre per application against Hemitarsonemus latus Banks was studied at Serere Eesearch Station, Uganda. DDT applied as a 10 per cent, dust, or in a spray from a 50 per cent, wettable powder increased the damage caused by the mite, while DDT applied in a spray from a 25 per cent. miscible liquid decreased it.

Another trial using a DDT miscible-liquid spray applied at intervals of 10, 15 and 20 days at 1 lb. active ingredient per acre per application demonstrated partial control of the mite. However, when spraying ceased, tea-mite damage increased. At the final count all spray intervals showed significantly less damage than the control and there was an over-all significant difference between spray treatments and the control. In both trials the number of mite-infested plants increased in an exponential manner with time.

It is not considered that the present recommended practice of applying DDT four times, at 15-day intervals, in a spray from 25 per cent, miscible liquid at 1 lb. active ingredient per acre will cause an increase of the mite on peasant-grown cotton in Uganda, although it will only partially control any infestation of it that is present.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 54 , Issue 3 , November 1963 , pp. 425 - 431
Copyright
Copyright © Cambridge University Press 1963

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

Berkson, J. (1944). Applications of the logistic function to bioassay.—J. Amer. statist. Ass. 39 pp. 357–365.Google Scholar
Davies, J. C. (1963). Insecticides on cotton in Uganda. Comparison of Sevin, BHC + Cereclor and DDT.—Emp. Cott. Or. Rev. 40 pp. 296–302.Google Scholar
Fadígas, M. jr., Gianotti, O. & Almeida, P. R. (1958). Experimentos de pulverizações com inseticidas sistêmicos em baixo volume para o contrôle de algumas pragas iniciais do algodoeiro.—Biológico 24 pp. 75–79. (Rev. appl. Ent., A 47 382.)Google Scholar
Gadd, C. H. (1946). Observations on the yellow tea mite Hemitarsonemus latus (Banks) Ewing.—Bull. ent. Res. 37 pp. 157–162.CrossRefGoogle Scholar
Ingram, W. R. (1960). The control of yellow tea mite Hemitarsonemus latus (Banks) with DDT on cotton in Uganda.—Bull. ent. Res. 51 pp. 577–582.CrossRefGoogle Scholar
Ingram, W. R. (1962). Effect of ‘ Eogor ’ (dimethoate) and DDT on cotton mites in Uganda.—Nature, Lond. 195 no. 4847 pp. 1224–1225.CrossRefGoogle Scholar
May, A. W. S. & Heather, N. W. (1958). Insecticide trials and notes on the control of the potato tuber moth in south Queensland.—Qd J. agric. Sci. 15 pp. 39–41. (R.A.E., A 47 81.)Google Scholar
Michelmore, A. P. G. (1954). C. Section of Entomology.—Rec. Dep. Agric. Uganda no. 3 (1950–1952) pp. 39–60.Google Scholar
Pearson, E. O. (1958). The insect pests of cotton in tropical Africa.—355 pp. London, Emp. Cott. Gr. Corp. & Commonw. Inst. Ent.Google Scholar
Schmitz, G. (1956). L'acariose du cotonnier.—Bull. INEAC no. 5 pp. 329–339.Google Scholar
Thomas, D. G. (1956). B. Section of Botany and Pathology.—Rec. Dep. Agric. Uganda no. 4 (1952–1954) pp. 3–9.Google Scholar
Vrydagh, J. M. (1942). Etude de l'acariose du cotonnier, causée par Hemitar-sonemus latus (Banks) au Congo Belge.—Publ. Inst. nat. agron. Congo beige Sér. sci. no. 28, 25 pp.Google Scholar