Table 4 Pathogenicity of 12 Bt isolates and a reference strain (HD1) against the 3rd instar larvae of S. littoralis after 24 and 48 h post-treatment
Strain | S. littoralis (Lepidoptera) | |||||
|---|---|---|---|---|---|---|
24 h | Mortality % | 48 h | Mortality % | |||
LC50 (μg/ml−1) | Slope ± SE | LC50 (μg/ml−1) | Slope ± SE | |||
1 | 41.1 | 5.3 ± 1.4 | 94 | 45.6 | 6.9 ± 1.2 | 100 |
2 | 43.4 | 4.7 ± 1.1 | 83 | 54.4 | 5.7 ± 1.0 | 96 |
3 | 26.1 | 0.7 ± 0.6 | 63 | 44.4 | 4.9 ± 0.7 | 93 |
4 | 45.4 | 3.4 ± 1.7 | 73 | 65.0 | 3.8 ± 1.4 | 80 |
5 | 68.5 | 0.7 ± 0.5 | 50 | 64.6 | 5.0 ± 1.6 | 93 |
6 | 57.5 | 0.8 ± 0.9 | 60 | 45.3 | 4.6 ± 1.5 | 86 |
7 | 23.4 | 0.7 ± 0.6 | 53 | 67.0 | 0.8 ± 0.9 | 63 |
8 | 61.4 | 4.9 ± 1.2 | 85 | 45.4 | 6.5 ± 1.5 | 100 |
9 | 56.1 | 5.1 ± 1.4 | 86 | 64.4 | 6.2 ± 1.5 | 100 |
10 | 34.0 | 0.6 ± 0.3 | 87 | 53.3 | 5.3 ± 1.7 | 94 |
11 | 57.9 | 5.3 ± 1.9 | 91 | 56.2 | 5.8 ± 1.8 | 100 |
12 | 39.7 | 3.2 ± 0.9 | 73 | 52.4 | 5.4 ± 1.6 | 93 |
HD1 | 51.5 | 5.3 ± 1.1 | 93 | 50.1 | 5.8 ± 1.3 | 100 |