Table 2 Pathogenicity parameters of Metarhizium rileyi to larval instars of Helicoverpa armigera after 7 days of treatment
Larval instars | LC50 | 95% fiducial limits (LC50) | LC90 | 95% fiducial limits (LC90) | Regression equation | χ2 calculated | χ2 tabulated |
|---|---|---|---|---|---|---|---|
1st | 5.51 × 103 | 1.65 × 103 and 1.62 × 104 | 2.86 × 106 | 4.93 × 105 and 8.04 × 107 | Y = 0.49X − 1.76 | 0.44 | 7.81 |
2nd | 1.86 × 104 | 5.85 × 103 and 6.87 × 104 | 1.56 × 107 | 1.79 × 106 and 1.27 × 109 | Y = 0.43X − 1.87 | 0.25 | 7.81 |
3rd | 2.81 × 105 | 6.77 × 104 and 1.11 × 106 | 1.72 × 109 | 1.37 × 108 and 2.53 × 1011 | Y = 0.33X − 1.84 | 0.38 | 9.48 |
4th | 5.55 × 105 | 1.44 × 105 and 2.35 × 106 | 2.87 × 109 | 2.19 × 108 and 4.41 × 1011 | Y = 0.35X − 1.97 | 0.17 | 9.48 |