Etude de l’efficacité de l’extrait des feuilles de Tephrosia vogelii Hook.f pour le contrôle de An. gambiaes.S.l résistant aux pyréthrinoïdes

Abstract

The present study aims at the efficacy of the biocidal property of Tephrosia vogelii in the control of pyrethroid-resistant vectors.Larval tests were carried out on the larvae of stages 2, 3 and 4 of An. gambiae s.s. of wild-type. The susceptible reference strain "Kisumu" served as a control.Mortalities were read 24 hours and 48 hours after exposure.LD 50 and 90 for 24 hours and 48 hours were determined according to the logprobit method of dose determination corresponding to a proportion. The high LD50 determined correspond to stage 3 larvae of wild populations in 24 hours and 48 hours. Low LD50 refer to Stage 2 "Kisumu" larvae. The highest LD90 correspond to stage 3 larvae of wild populations. The weak refer to Stage 4 "Kisumu". The ratios determined indicate a negligible influence of resistance on the bliss of plant extracts. Larvicidal activity of plant extracts at unprivileged doses on larvae of sensitive and wild strains provides an alternative advantage in the management of vector resistance to pyrethroids.