Table 3 Population growth parameters of E. formosa parasitising fourth nymphal instars of T. vaporariorum
S. No. | Parameter | Estimate±SE | |
|---|---|---|---|
Third instar | Fourth instar | ||
1. | Gross reproductive rate (GRR) (females/female) | 27.78±0.33 | 29.93±0.43 |
2. | Net reproductive rate (R0) (females/female) | 26.71±0.56 | 27.15±0.57 |
3. | Approximate generation time (Tc) (days) | 22.53±0.26 | 20.89±0.28 |
4. | Innate capacity for natural increase (rc) (females/female/day) | 0.1458±0.001 | 0.1581±0.002 |
5. | True intrinsic rate of increase (rm) (females/female/day) | 0.1472±0.001 | 0.1596±0.002 |
6. | True generation time (T) (days) | 22.32±0.25 | 20.69±0.27 |
7. | Finite rate of natural increase (λ) (females/day) | 1.16±0.002 | 1.17±0.002 |
8. | Weekly multiplication rate (WM) (folds) | 2.80±0.03 | 3.06±0.03 |
9. | Doubling time (DT) (days) | 4.71±0.04 | 4.34±0.04 |