Insecticide Class Recommended dosage of active ingredient (g/m2)[5] Duration of effective action (months) Estimated cost per house per 6 months (US$)[6] WHO toxicity rating[7] DDT Organochlorine 1–2 >6 1.60 II Fenitrothion Organophosphate 2 3–6 14.80 II Malathion Organophosphate 2 2–3 8.20 III Pirimiphos-methyl Organophosphate 1–2 2–3 III Propoxur Carbamate 1–2 3–6 18.80 II Bendiocarb Carbamate 0.1–0.4 2–6 13.80 II Alpha-cypermethrin Pyrethroid 0.02–0.03 4–6 II Cyfluthrin Pyrethroid 0.02–0.05 3–6 II Deltamethrin Pyrethroid 0.02–0.025 3–6 1.60 II Etofenprox Pyrethroid 0.1–0.3 3–6 U Lambda-cyhalothrin Pyrethroid 0.02–0.03 3–6 8.60 III Bifenthrin Pyrethroid 0.025–0.05 3–6 II Clothianidin Neonicotinoid