Foreign Title :
Bericht über Versuche mit Fliegenleim.
Archiv fur Schiffs- und Tropenhygiene
These experiments were devised to see if Glossina palpalis could be exterminated in circumscribed areas by CLEVE'S tsetse lime method. They were carried out at the mouth of the river Mnege (? Tanganyika), where this species is numerous and where four isolated groves of trees stand. Fly communication between these was prevented by the destruction of the long grass and reeds. The experiment took place in March during the rainy season. To begin with, practised fly-catchers caught flies in each of the four places between eight o'clock and midday. Every day for a fortnight a goat provided with limed cloths was taken to each place, tended by a boy provided also with limed cloths. At the end of the fortnight control catches were made by the fly-catchers, and fourteen days later more controls. The results are shown in a table. It is noted that the numbers of flies caught did not steadily diminish, but after a preliminary diminution remained stationary; that a single fly-catcher in four hours caught about the same number of flies as a man-trap and goat-trap together during the whole day; and that at the end of the experiment the number of flies had diminished in each group. However, at the second fly catching, fourteen days later, the numbers had increased again. It is concluded that it is not possible to exterminate palpalis, even under favourable conditions and in a small space, by this method. The boy and the goat were free from trypanosomes at the outset; at the end of the experiment each was found to be infected. It is doubted whether the boy's infection was contracted during the experiment, but it is advised that natives who take part in such demonstrations should be kept under the influence of atoxyl. It is noted that more male flies were caught than female, and more than three times as many on the boy as on the goat. Some details of cost are given. The lime was of no use for catching mosquitoes.
By means of the lime spread on a board four rats were caught by the tails; the rest disappeared from the building. It is suggested that the lime, which has small value in exterminating tsetse flies, may have a future as a rat-trap.
[These results correspond with those of KOCH, whose experiments concerned G. morsitans in German East Africa (Sleeping Sickness Bulletin Vol. 4, p. 263). He demonstrated 'the great superiority of a single fly-catcher over not only a single flytrap but the whole lot put together.' The lime method may have its uses, but they are more limited than CLEVE'S experiments seemed to show.]
A. G. B.
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