Table 1: Mortalities and knockdown times (KDT) for male adults of OX513A (OX) and wild-type Aedes aegypti from Aurangabad (AWD) and Delhi (DEL) against diagnostic concentrations of four synthetic insecticides.

Insecticide (% conc)Strain Mortality 24 h (%) 
Mean ± SE
KDT in minutes (95% CI)Regression linePearson chi-square test valueSusceptibility status
KDT10KDT50KDT99 (df)

DDT 4%OX (89)90.9 ± 1.817.6
(13.3–21.1)
41.3
(37.2–46.8)
194.0
(136.0–351.3)
0.9025.6 (10)0.004Resistance likely
AWD (80)87.4 ± 5.434.7
(32.0–36.9)
57.5
(54.4–61.9)
143.5
(119.1–188.2)
0.863.7 (10)0.961Resistant
DEL (85)44.4 ± 12.855.6320.27681.20.18102.1 (10)<0.0001Resistant


Malathion 5%OX (92)100.0 ± 022.7
(20.5–24.5)
33.6
(32.0–35.3)
68.9
(62.4–78.6)
0.9516.1 (10)0.098Susceptible
AWD (92)100.0 ± 026.4
(18.7–30.8)
38.1
(34.3–42.2)
59.3
(52.7–72.7)
0.88109.0 (10)<0.0001Susceptible
DEL (89)100.0 ± 025.5
(20.9–28.8)
41.3
(38.1–44.9)
99.2
(80.9–140.0)
0.9234.5 (10)<0.0001Susceptible

Deltamethrin 0.05%OX (99)100.0 ± 05.9
(4.7–6.9)
8.7
(7.6–9.6)
17.2
(14.8–22.1)
0.3421.7 (10)<0.017Susceptible
AWD (97)100.0 ± 06.2
(5.4–6.8)
8.6
(8.0–9.1)
15.5
(14.1–17.7)
0.332.6 (10)0.989Susceptible
DEL (100)100.0 ± 09.6
(5.6–12.2)
14.8
(11.4–17.5)
32.6
(25.7–56.1)
0.5895.7 (10)<0.0001Susceptible

Permethrin 0.75%OX (100)100.0 ± 09.9
(8.1–11.0)
12.5
(11.3–13.7)
19.1
(16.7–25.1)
0.4231.9 (10)<0.0001Susceptible
AWD (89)100.0 ± 07.6
(5.4–9.2)
12.0
(10.2–13.7)
27.9
(23.0–38.8)
0.5035.8 (10)<0.0001Susceptible
DEL (96)100.0 ± 07.9
(4.8–10.4)
15.4
(12.1–18.2)
51.5
(39.1–84.6)
0.8069.3 (10)<0.0001Susceptible

Differences in mean values indicated by the same letters within rows are nonsignificant at the 0.05 level by one-way ANOVA using Tukey’s -test; CI not calculable.