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Insecticide drift and reinvasion of spray blocks in aerial spraying experiments against Glossina Morsitans Centralis Machado (Diptera: Glossinidae)

Published online by Cambridge University Press:  10 July 2009

J. E. Davies
J. E. Davies
Affiliation:
Tsetse Fly Control Department, Manu, Botswana
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Abstract

The effect of insecticide drift on Glossina morsitans centralis Machado in Botswana was assessed using two-man fly-rounds downwind of the 1700–4000 km2 aerial spraying blocks. The blocks were subjected to sequential applications of endosulfan at between 6 and 12 g/ha with a droplet v.m.d. of 30 μm. Post-spray reinvasion of flies was assessed using two-man fly-round surveys across the edge of one spray block along ideal linear habitat. Each application had an effect on the flies outside the spray block, even at a distance of 20 km downwind. The first two applications of a series had a greater effect than later ones. Total reductions of G. m. centralis after a series of 5 or 6 applications were 92·5% 7 km outside a block sprayed in 1975, 98·3% 6–12 km outside a block sprayed in 1977 and 64·2% 10–20 km outside a block sprayed in 1978. Ageing studies showed that some females 10–20 km downwind of the sprayed area survived up to five applications, and three months after the final application the population there had recovered almost to pre-spray levels. The main front of fly encroachment after spraying across the downwind edge of the 1978 block travelled at about 0·8 km/month in the first 17 months after spraying, but small numbers of flies were found well ahead of the main front. It was concluded that the situation in the drift area could be ideal for the development of insecticide resistance and that adjacent blocks sprayed in consecutive years should overlap by 10 km.

Type
Original Articles
Information
Bulletin of Entomological Research , Volume 71 , Issue 3 , September 1981 , pp. 499 - 508
Copyright
Copyright © Cambridge University Press 1981

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References

Challier, A. (1965). Amélioration de la méthode de détermination de l'âge physiologiqué des glossines. Études faites sur Glossina palpalis gambiensis Vanderplank, 1949.—Bull. Soc. Path. exot. 58, 250–259.Google Scholar
Chapman, N. G. (1976). Aerial spraying of tsetse flies (Glossina spp.) in Rhodesia with ultra low volumes of endosulfan.—Trans. Rhod. scient. Ass. 57, 12–21.Google Scholar
Davies, H. & Blasdale, P. (1960). The eradication of Glossina morsitans submorsitans Newst. and Glossina tachinoides Westw. in part of a river flood plain in Northern Nigeria by chemical means. Part III.—Bull. ent. Res. 51, 265–270.Google Scholar
Davies, J. E. (1978). The use of ageing techniques to evaluate the effects of aerial spraying against Glossina morsitans centralis Machado (Diptera: Glossinidae) in northern Botswana.—Bull. ent. Res. 68, 373–383.CrossRefGoogle Scholar
Davies, J. E. & Bowles, J. (1979). Effect of large-scale aerial applications of endosulfan on tsetse fly, Glossina morsitans centralis Machado, in Botswana.—17 pp. London, Centre for Overseas Pest Research (Misc. Rep. no. 45).Google Scholar
De Sousa, A. E. (1961). The advance of Glossina in southern Mozambique.—pp. 203–218in International Scientific Committee for Trypanosomiasis Research. Eighth Meeting, Jos 1960.—321 pp. London, Commission for Technical Co-operation in Africa south of the Sahara (Publication no. 62).Google Scholar
Ford, J. (1961). The advance of Glossina morsitans and Glossina pallidipes into the Sabi and Lundi River basins, Southern Rhodesia.—pp. 219–229in International Scientific Committee for Trypanosomiasis Research. Eighth Meeting, Jos 1960.—321 pp. London, Commission for Technical Co-operation in Africa south of the Sahara (Publication no. 62).Google Scholar
Jack, R. W. (1914). Tsetse fly and big game in Southern Rhodesia.—Bull. ent. Res. 5, 97–110.CrossRefGoogle Scholar
Jackson, C. H. N. (1933). On an advance of tsetse-fly in central Tanganyika.—Trans. R. ent. Soc. Lond. 81, 205–221.CrossRefGoogle Scholar
Jackson, C. H. N. (1946). An artificially isolated generation of tsetse flies (Diptera).—Bull. ent. Res. 37, 291–299.Google Scholar
Jackson, C. H. N. (1948). Some further isolated generations of tsetse flies.—Bull. ent. Res. 39, 441–451.CrossRefGoogle ScholarPubMed
Mulligan, H. W. & Potts, W. H. (Eds.). (1970). The African trypanosomiases.—950 pp. London, Allen & Unwin.Google Scholar
Park, P. O., Gledhill, J. A., Alsop, N. & Lee, C. W. (1972). A large-scale scheme for the eradication of Glossina morsitans morsitans Westw. in the Western Province of Zambia by aerial ultra-low-volume application of endosulfan.—Bull. ent. Res. 61, 373–384.CrossRefGoogle Scholar
Robertson, A. G. & Kluge, E. B. (1968). The use of insecticide in arresting an advance of Glossina morsitans Westwood in the south-east lowveld of Rhodesia.—Proc. Trans. Rhod. scient. Ass. 53, 17–33.Google Scholar
Wilson, S. G., Morris, K. R. S., Lewis, I. J. & Krog, E. (1963). The effects of trypanosomiasis on rural economy with special reference to the Sudan, Bechuanaland and West Africa.—Bull. Wld Hlth Org. 28, 595–613.Google Scholar