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A diurnal and seasonal study of the feeding activity of Glossina pallidipes Aust.

Published online by Cambridge University Press:  10 July 2009

R. D. Pilson  and
B. M. Leggate
R. D. Pilson
Affiliation:
Tsetse and Trypanosomiasis Control Branch, Federal Department of Veterinary Services, Salisbury, Southern Rhodesia.
B. M. Leggate
Affiliation:
Tsetse and Trypanosomiasis Control Branch, Federal Department of Veterinary Services, Salisbury, Southern Rhodesia.
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Extract

In a continuation of studies of diurnal and seasonal feeding activity of Glossina pallidipes Aust. in thick riverine vegetation at Rekomitjie, in the Zambezi Valley, Southern Rhodesia, flies attracted to a stationary black ox were allowed to become engorged, then caught, marked and released. More flies fed per day in the late dry season (November), and fewer during the rainy season (February), than at other times of the year. The proportions of females amongst flies feeding, and of marked flies recaptured, were greatest in May (77·6 and 20·0 per cent., respectively) and least in November (59·2 and 7·7 per cent., respectively). The diurnal pattern of feeding activity was similar in all seasons, there being a well-marked peak of activity at or shortly before sunset.

The trypanosome infection rate was obtained by dissecting flies caught near the experimental site and was combined with figures for the number of flies attacking the ox to give an estimate of the seasonal trypanosome risk (mean number of infected flies that fed on the ox per day); this was greatest in November and smallest in February.

From comparison of catches off a moving and a stationary ox, two stationary oxen standing together, and two standing out of sight of one another, in each case one being red and the other black, it appears that colour of the bait-animal is not of great importance as an attractant to G. pallidipes unless a definite choice is presented, when flies show preference for feeding on a dark surface.

Type
Research Paper
Information
Bulletin of Entomological Research , Volume 53 , Issue 3 , October 1962 , pp. 541 - 550
Copyright
Copyright © Cambridge University Press 1962

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