Figure 2

Crude results from experimental hut trials of pirimiphos-methyl and lambda-cyhalothrin on Anopheles gambiae s.l. Entry rate, number of mosquitoes per hut per night; exit rate, proportion of mosquitoes found in the veranda trap out of mosquitoes that entered; feeding rate, proportion of mosquitoes that were blood fed out of mosquitoes that entered; mortality rate, proportion of mosquitoes that were found dead or died after 24 hours post-collection out of mosquitoes that entered. The first horizontal axis labels refer to the period after spraying, with period 1 (months 1–3, corresponding to 40 trapping nights), period 2 (months 4–6, corresponding to 39 trapping nights), and period 3 (months 7–12, corresponding to 77 trapping nights). The second horizontal axis labels refer to the material of the walls of the huts where ‘brick’ refers to walls from concrete bricks coated with cement and where banco refers to wood structures coated in dry mud. The third (bottom) horizontal axis labels refer to experiment arms: a control, a lambda cyhalothrin (ICON 10 CS) and four different formulations of pirimiphos-methyl (Actellic 50 EC, CS AA, CS B, and CS BM).