[The use of screens in the anti-tsetse campaign in the forest zone]

After preliminary studies on the ecodistribution of Glossina palpalis s.l. in the sleeping sickness focus of Vavoua (Ivory Coast) trials with screens impregnated with decamethrine were carried out. Artificial supports for insecticide present several advantages: less pollution, less costly, simplicity, facility of use by local personnel, possibility of re-use, integration with other methods. On the other hand, its action based on the attraction of flies which come into contact with the screen is relatively slow, particularly in obtaining a complete interruption of reproduction. The technique is compared with other control methods as the use of biconical traps and selective spraying along borders. Its action can be improved by the addition of attractive host odours or sex pheromones.