Side-effects of experimental pyrethroid applications for the control of tsetse flies in a riverine forest habitat (Africa)

During tsetse control operations near Bouafle, Ivory Coast, Africa, a study was made of environmental side-effects of helicopter sprayings with permethrin and deltamethrin on a riverine forest. Populations of mayfly-larvae and small shrimps (Caridina africana ) were virtually eliminated after the spraying cycle. The Ephemeroptera recovered within the same season. Caddis-fly and Simulium -larvae populations were affected but they recovered within each spraying interval. Large shrimps (Macrobrachium rollenhovenii ) were paralyzed by the insecticide. Recovery occurred within 48 hr. Among the terrestrial arthropods, the hymenopteran and dipteran populations were significantly affected.