Table 2 Repellent activities (%) of Lemon grass and T. minuta essential oils in five concentrations ranging from 0.125 to 1 mg/ml against P. duboscqi, Neveu Lemaire
| Â | Oil conc. (mg/ml) | Repellency (%) | |||||
|---|---|---|---|---|---|---|---|
30Â min | 60Â min | 90Â min | 120Â min | 150Â min | 180Â min | ||
Essential oil | 0.125 | 96.875 ± 0.20 | 84.62 ± 2.08 | 53.40 ± 2.14 | 52.05 ± 0.38 | 43.91 ± 0.19 | 51.3 ± 1.71 |
|  | 0.25 | 96.875 ± 0.19 | 98.21 ± 0.33 | 98.81 ± 0.19 | 90.66 ± 0.51 | 83.57 ± 1.90 | 59.13 ± 0.51 |
C. citratus | 0.50 | 97.81 ± 0.30 | 97.69 ± 0.20 | 98.09 ± 0.20 | 92.94 ± 0.20 | 93.70 ± 1.00 | 89.13 ± 1.20 |
|  | 0.75 | 99.38 ± 0.20 | 97.44 ± 0.19 | 98.34 ± 0.19 | 99.0 ± 0.19 | 100.0 ± 0.00 | 87.67 ± 0.67 |
|  | 1.00 | 100.00 ± 0.00 | 100.00 ± 0.00 | 98.72 ± 0.20 | 99.77 ± 0.20 | 100.00 ± 0.00 | 100.0 ± 0.00 |
|  | 0.125 | 83.72 ± 1.00 | 58.46 ± 2.14 | 48.94 ± 2.83 | 44.31 ± 3.42 | 28.69 ± 2.36 | 21.49 ± 2.27 |
Tagetes minuta | 0.25 | 90.23 ± 0.80 | 64.10 ± 2.20 | 70.21 ± 2.08 | 60.98 ± 4.55 | 51.3 ± 3.01 | 46.81 ± 5.81 |
|  | 0.50 | 96.88 ± 0.33 | 91.53 ± 0.33 | 86.53 ± 0.67 | 74.51 ± 3.84 | 58.22 ± 3.34 | 52.22 ± 7.78 |
|  | 0.75 | 98.14 ± 0.40 | 100.00 ± 0.00 | 97.87 ± 0.19 | 88.45 ± 0.84 | 64.35 ± 2.34 | 75.96 ± 1.76 |
|  | 1.00 | 100.0 ± 0.00 | 100.00 ± 0.00 | 98.81 ± 0.19 | 98.68 ± 0.00 | 91.30 ± 0.60 | 88.89 ± 1.57 |
Controls |  |  |  |  |  |  |  |
 DEET | 0.196 | 100.0 ± 0.00 | 100.0 ± 0.00 | 100.0 ± 0.00 | 100.0 ± 0.00 | 100.0 ± 0.00 | 95 ± 1.70 |