Evaluation of the efficacy of bendiocarb 80% WP as indoor residual spray on three local building materials against Anopheles arabiensis (Patton) (Diptera: Culicidae) using laboratory models

In the Sudan, indoor residual spraying (IRS) campaigns currently depend on carbamate insecticide Bendiocarb (2, 2 dimethyl-2H-1,3-benzodioxol-4-yl methyl carbamate; Ficam® 80% WP) at 200 mg/m² against Anopheles arabiensis Patton (Diptera: Culicidae) and other mosquitoes some household pests. Households building materials in targeted villages are mainly constructed by using different local (wood straw), mud bricks a third group use cement their walls. The activity (persistence) of substrates/materials (viz. straw, mud, cement), glass, which is used as non-absorbent substrate was determined. susceptibility to tested 5 concentrations (i.e. 80, 40, 20, 10, 5, 2.5 ppm). Ten adults were exposed for 24 hr. each these concentrations, replicated 4x, experiment repeated twice. substrates attached wall sprayed recommended WHO; WHO bioassay tests carried out evaluation standard cones. LC50 proved be 58ppm LC90 143 ppm, slope log-dose-probability line (Ld-P lines) 3.04. During first months 100% mortality obtained substrates. 2nd month showed all substrates, except (92.5% mortality). 3rd month, rate straw but 95% 87.5% registered cement, respectively. 4th results 60, 72.5, 90% following same order. However, after months, was: 25% 35% 42% 65% glass. It concluded that performance lowest 4 materials. stayed longer material, followed straw. glass substrate, persisted than could attributed its nature not absorbent inert material. Therefore, should an effective IRS A. materials, treatment least 2x / yr.