Volume 13, Issue 3
  • ISSN: 0002-9637
  • E-ISSN: 1476-1645



Incidence and breeding of the tsetse fly (R.-D.) were studied along an 82-mile section of a new road that passes through the forest, broken forest, and grassland regions of the Western Province of Liberia. A potentially dangerous fly population infests the road throughout its length. The roadside incidence of flies is higher in the forest than in the broken forest or in the grassland, but in the latter regions the scarcity of alternative food hosts has encouraged the fly population to feed on man.

The roadside fly breeding-grounds are along the rivers and not around smaller water localities like creeks and water-holes. Maximal breeding of the flies occurred during the driest period of the year, from December to February, with a temporary cessation in breeding during the wettest period, from July to September.

In the grassland the road merges with an endemic focus of sleeping sickness. This has made the roadside fly population hazardous to both local and outside human populations, since the disease seems to have spread linearly along the road since its construction.


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