Table 1 Susceptibility of An.subpictus sibling species populations to common insecticides (number of adults in each sibling species tested against each insecticide is ≥ 100)
Insecticide | District | Percentage mortality | |||
|---|---|---|---|---|---|
| Â | Â | A | B/ An. sundaicus s.l . | C | D |
DDT | Batticaloa | 25 ± 2 (R) | 38 ± 2 (R) | 28 ± 1(R) | 23 ± 4(R) |
(5%) | Puttalam | ND | 47 ± 1(R) | 24 ± 2(R) | 27 (R) |
|  | Trincomalee | ND | 41 ± 3 (R) | 25 ± 2 (R) | 26 ± 1 (R) |
|  | Ampara | ND | 41 ± 2 (R) | 16 ± 3(R) | 35 ± 3 (R) |
Malathion | Batticaloa | ND | 97 ± 2 (V) | 62 ± 1 (R) | 62 ± 1(R) |
(4%) | Puttalam | ND | 98 ± 2(S) | 49 ± 4(R) | 59 ± 1(R) |
|  | Trincomalee | 64 ± 1(R) | 93 ± 4(V) | 62 ± 1(R) | 69 (R) |
|  | Ampara | ND | 97 ± 1(V) | 63 ± 2(R) | 61 ± 3(R) |
Deltamethrin | Batticaloa | 80 ± 3(V) | 97 ± 1 (V) | 82 ± 3(V) | 93 ± 1 (V) |
(0.05%) | Puttalam | ND | 97 ± 3(V) | 88 ± 2 (V) | 96 ± 2(V) |
|  | Trincomalee | 100(S) | 98 ± 1(S) | 86 ± 2 (V) | 94 ± 2(V) |
|  | Ampara | ND | 100(S) | 88 ± 1 (V) | 96 ± 2(V) |
λ-Cyhalothrin | Batticaloa | ND | 100(S) | 85 ± 6 (V) | 97 ± 1(V) |
(0.05%) | Puttalam | ND | 100(S) | 72 ± 2 (R) | 84 (V) |
|  | Trincomalee | ND | 100(S) | 75 ± 2 (R) | 88 ± 2(V) |
|  | Ampara | ND | 100(S) | 77 ± 2(R) | 86 ± 4 (V) |