Table 1.
Expected versus observed corrected mortality at day 14 for combination treatments.
| Pyrethrum (ppm) | B. bassiana (conidia mL−1) | Observed proportional mortality (median ± quartiles)a | Observed corrected mortality (median ± quartiles)b | Expected corrected mortality (median ± quartiles)c | Effect typed |
|---|---|---|---|---|---|
| Control | Control | 0.20 (0.18–0.23) | – | – | |
| 25 | – | 0.30 (0.28–0.35) | 0.12 (0.08–0.19) | – | |
| 100 | – | 0.40 (0.40–0.50) | 0.29 (0.22–0.44) | – | |
| – | 1 × 104 | 0.50 (0.33 -0.65) | 0.42 (0.18–0.56) | – | |
| – | 1 × 105 | 0.55 (0.48–0.60) | 0.44 (0.38–0.46) | – | |
| 25 | 1 × 104 | 0.40 (0.35–0.43) | 0.20 (0.13–0.28) | 0.54 (0.23–0.71) | 21.41 (Antagonistic) |
| 100 | 1 × 104 | 0.60 (0.48–0.70) | 0.53 (0.37–0.63) | 0.68 (0.39–0.83) | 3.76 (Additive) |
| 25 | 1 × 105 | 0.60 (0.50–0.60) | 0.50 (0.34–0.51) | 0.52 (0.49–0.54) | 0.08 (Additive) |
| 100 | 1 × 105 | 0.75 (0.60–0.83) | 0.71 (0.50–0.78) | 0.63 (0.60–0.68) | 1.02 (Additive) |
an = 4, bcalculated following Schneider–Orelli’s formula48, c1 − ((1 − A) × (1 − B)), where A and B are the corrected proportional mortality due to EPF and pyrethrum treatments alone. dCalculated from Chi-squared test against expect mortality from individual treatments.