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Egyptian Journal of Biological Pest Control

Table 3 Regression equation of pathogenicity of Metarhizium guizhouense Xct1 to Spodoptera frugiperda larvae

From: Isolation and identification of Metarhizium guizhouense Xct1 and its pathogenicity to Spodoptera frugiperda (J.E. Smith) (Lepidoptera: Noctuidae)

Stages

Pathogenicity regression equation

Correlation coefficient

LC50 (spores/ml)

95% confidence limits

egg

y = − 3.848 + 0.709x

0.943

2.26 × 105

1.27 × 105–5.22 × 105

First

y = − 2.156 + 0.439x

0.986

8.12 × 104

3.29 × 104–1.66 × 105

Second

y = − 1.910 + 0.383x

0.980

1.11 × 105

4.10 × 104–2.43 × 105

Third

y = − 2.352 + 0.409x

0.989

5.55 × 105

2.64 × 105–1.11 × 106

Fourth

y = − 2.716 + 0.412x

0.990

3.87 × 106

1.93 × 106–8.68 × 106

Fifth

y = − 2.713 + 0.379x

0.987

1.43 × 107

6.26 × 106–4.30 × 107

Sixth

–

–

–

–

  1. LC50 represents the concentration required to kill 50% of the individuals in the insect population tested. “–” indicates that the final mortality rate of S. frugiperda larvae is less than 50%, and LC50 cannot be estimated
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