A. Seketeli et Fas. Kuzoe, DIURNAL RESTING SITES OF GLOSSINA-PALPALI S-PALPALIS (ROBINEAU-DESVOIDY) IN A PREFOREST ZONE OF COTE-DIVOIRE, Insect science and its application, 15(1), 1994, pp. 75-85
The diurnal resting sites of Glossina palpalis palpalis were studied f
rom October 1981 to December 1982 in the human trypanosomiasis focus a
t Bouafle (Ivory Coast). A total of 1382 resting tsetse (970 males and
412 females), were found after 757 hr of search in their natural habi
tats. At any season, over 80% of the flies were resting on lianas (Aca
cia pennata in particular), on coffee trees (Coffea indica) and on Eup
atorium odoratum. Almost all the flies showed a preference for resting
on the underside of woody parts of plants selected. The heights of th
e resting sites ranged from 10 cm to 2.5 m above the ground and their
diameters ranged from 0.1 cm to 8 cm. It must be stressed that both in
the dry and in the rainy seasons, more than 50% of the flies rested b
elow 50 cm from the ground and over 90% of these favoured stems and br
anches measuring less than 3 cm in dia. In the vegetation surrounding
villages or along the main access roads and bush pathways, G.p. palpal
is were found resting at 1 m to 5 m from the edge of its vegetation ha
bitat. About 27% of flies were engorged or showed at least red blood m
eals in their guts. The catching of resting flies therefore, appears t
o be an excellent way of collecting fresh blood meals for identificati
on of the natural vertebrate hosts of G.p. palpalis in the study area.
The practical interest of the study is discussed and recommendations
made for the selective application of residual insecticides in the tse
tse habitats to control the vectors of sleeping sickness in the Bouafl
e focus.