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Table 5 Knockdown times (KdT50 and KdT95) in minutes for Anopheles gambiae s.l. populations from Magu agro-ecosystem zone, Mwanza region, January–September, 2014

From: Farmers’ pesticide usage practices in the malaria endemic region of North-Western Tanzania: implications to the control of malaria vectors

Season Insecticide KdT50 Kisumu KdT50 An. gambiae s.l. KdT95 An. gambiae s.l. KdT50R
  Permethrin 0.75% 44.74 [41–46] 38.01 [31–43] 63. 37 [51–74] 0.85
Long rains Deltamethrin 0.05% 20.38 [17–22] 28.31 [25–30] 52.67 [51–54] 1.39
Lambdacyhalothrin 0.05% 28.56 [28–29] 26.05 [19–31] 53.59 [49–60] 0.91
Etofenprox 0.5% 27.00 [25–28] 43.47 [40–44] 69.51 [64–72] 1.61
Cyfluthrin 0.15% 16.23 [12–19] 41.98 [39–45] 68.67 [62–77] 2.58
DDT 4% 35.14 [33–35] 35.49 [34–35] 54.49 [52–57] 1.01
Permethrin 0.75% 44.74 [41–46] 44.40 [36–68] 72.61 [54–118] 0.99
Dry season Deltamethrin 0.05% 20.38 [17–22] 45.36 [42–53] 72.31 [63–84] 2.23
Lambdacyhalothrin 0.05% 28.56 [28–29] 44.85 [40–50] 70.40 [66–80] 1.57
Etofenprox 0.5% 27.00 [25–28] 34.46 [26–38] 58.22 [52–63] 1.27
Cyfluthrin 0.15% 16.23 [12–19] 27.91 [24–30] 51.01 [49–53] 1.72
DDT 4% 35.14 [33–35] 68.11 [45–99] 114.90 [70–180] 1.94
Permethrin 0.75% 44.74 [41–46] 62.40 [53–69] 103.16 [88–114] 1.39
Short rains Deltamethrin 0.05% 20.38 [17–22] 40.19 [33–42] 64.29 [56–68] 1.97
Lambdacyhalothrin 0.05% 28.56 [28–29] 68.82 [58–82] 114.97 [95–139] 2.41
Etofenprox 0.5% 27.00 [25–28] 48.78 [40–54] 76.09 [62–86] 1.81
Cyfluthrin 0.15% 16.23 [12–19] 50.25 [46–55] 82.66 [77–92] 3.09
DDT 4% 35.14 [33–35] 40.18 [38–14] 61.47 [58–64] 1.14
  1. KdT50 refers to time taken to knock down 50% of tested mosquitoes. KdT50R is the resistance ratio (RR) obtained by dividing the
  2. KdT50 of the tested wild population by the KdT50 of the susceptible strain (Kisumu)