The effect of blood feeding on insecticide induced mortality in Anopheles arabiensis SENN-DDT females. Mean percentage mortalities 24 hours post exposure are given for DDT (A), permethrin (B), deltamethrin (C) and malathion (D). Insecticide bioassays were conducted 4 hours post blood meal and mortalities are plotted by age and blood feeding regimen i.e. sugar fed only (0 blood), single blood meal (1 blood), multiple blood meals (multiblood). P-values obtained by 2-sample test indicate degree of significance in differences in mortalities between blood-fed cohorts and their respective sugar fed control cohorts.