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Table 3 Median lethal concentration (LC50) values of Bacillus thuringiensis strain isolated from soil bioassayed against the third-instar larvae of Helicoverpa armigera Hübner

From: Pathogenicity of indigenous soil isolate of Bacillus thuringiensis to Helicoverpa armigera Hübner 1809 (Lepidoptera: Noctuidae)

Treatments Observation time (h) LC50 (× 105 cfu/ml) 95% FL Slope χ2 (df = 10) P value
Without salt 72 2.204 1.762–4.644 4.005 ± 0.343 169.43 0.615
96 1.699 1.225–4.280 2.218 ± 0.188 132.77 0.472
120 1.270 0.903–1.912 3.571 ± 0.206 243.69 0.403
With salt 72 2.529 1.804 ± 0.192 152.28 0.858
96 1.797 1.325–4.118 2.397 ± 0.194 192.47 0.626
120 1.132 0.793–1.561 3.633 ± 0.203 226.39 0.349
  1. LC 50 lethal concentration (× 105 cfu/ml) of tested Bt treatment that killed 50% of exposed larvae, FL 95% Fiducial (confidence) limits, df degree of freedom, – incalculable