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Egyptian Journal of Biological Pest Control

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
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