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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

From: Isolation and identification of Bacillus thuringiensis strains native of the Eastern Province of Saudi Arabia

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