Table 2 Observed knock-down for DDT and the pyrethroids tested

DDT

Number tested

108

100

124

106

106

KD50 (min)

34.57

49.52

52.37

no kd

20.06

(31.05–38.71)

(44.93–55.51)

(43.94–68.50)

(18.25–21.98)

KD95 (min)

90.54

174.86

197.56

no kd

35.13

(73.57–123.55)

(136.28–247.58)

(126.78–458.52)

(30.81–42.71)

deltamethrin

Number tested

106

103

107

103

KD50 (min)

7.79

10.28

9.93

-

10.93

(1.59–12.69)

(9.71–10.77)

(9.31–10.43)

(10.26–11.53)

KD95 (min)

73.27

14.71

14.43

-

17.25

(43.77–403.87)

(13.72–16.34)

(13.45–16.12)

(16.00–19.17)

lambdacyhalothrin

Number tested

119

102

103

101

KD50 (min)

21.42

19.12

20.19

-

16.63

(16.39–26.46)

(17.14–21.16)

(18.01–22.37)

(15.90–17.42)

KD95 (min)

85.91

38.41

55.10

-

20.20

(59.22–181.26)

(33.16–47.55)

(46.79–69.03)

(19.00–22.47)

permethrin

Number tested

-

147

113

100

102

KD50 (min)

-

31.89

55.61

7.35

9.05

(25.28–41.89)

(49.46–65.29)

(0.09–14.00)

-

KD95 (min)

-

194.85

164.88

138.15

10.33

(109.60–698.53)

(123.03–262.62)

(59.42–76.10³)

-