Initial Field Studies in Upper Volta with Dichlorvos Residual Fumigant as a Malaria Eradication Technique. 2. Entomological Evaluation.

In mud houses in Wakara, Upper Volta, dichlorvos dispensers installed at the rate of one dispenser per approximately 500 cubic feet (14 m(3)) produced 70% or higher average kills of adult Aëdes aegypti, exposed overnight in screen wire cages suspended at levels of 6 feet (1.8 m) and 2 feet (0.6 m), for approximately three months during the wet season and four months during the dry season. Average kills of 96% and 80% were obtained in the dry season at the 6-foot and 2-foot levels, respectively, with 6-hour daytime exposures 17-22 weeks after treatment.