The problem of the Simulium neavei complex.
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S. neavei, the vector of onchocerciasis, has been virtually eradicated from Kenya by larviciding measures in which DDT was used. Only a very small area remains infested and this is in the course of being treated by the Uganda medical authorities as it is part of a much larger focus occurring in that country. An account is given of the various surveys which have been carried out during the last ten years in Nyanza Province, involving 15 000 square miles (about 40 000 km(2)), and survey techniques are described. An account is given of the eradication measures carried out in North and South Nyanza, and techniques in connexion with dosing and checking operations are described. Costs for both surveys and eradication schemes are given, and minimum requirements for transport are indicated.
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A general account is given of insecticidal control of black-flies in North and Central America, and the problems are contrasted with those arising in the control of Simulium damnosum Theo. in Nigeria. Some recent biological observations on Canadian black-flies are described, and it is emphasized that these have materially contributed to successful control. It is pointed out that S. damnosum control is being practised in the absence of much fundamental biological knowledge of this pest. Entomological aspects of onchocerciasis in Mexico and Guatemala are discussed, and compared with S. damnosum and its relationship to onchocerciasis in Nigeria.
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