Table 2 Tri-trophic effects of Bt (Cry1Ac/Cry2Ab) cotton on life table parameters of Cotesia marginiventris parasitizing Cry1Ac/Cry2Ab-resistant Trichoplusia ni reared on Bt cotton or non-Bt cotton incorporated diet. Data are shown as means ± SE; each experimental unit was replicated 10 times.
Parameters | Non-Bt cotton | Bt cotton | Statistics |
|---|---|---|---|
Development time (days) | |||
Eggs to cocoons | 10.4 ± 0.1 | 10.2 ± 0.1 | t = 1.27; P = 0.23 |
Cocoons to adults | 6.1 ± 0.1 | 6.0 ± 0.1 | t = 0.79; P = 0.45 |
Success of parasitism (%) | 96.0 ± 1.6 | 95.0 ± 2.2 | t = 0.36; P = 0.72 |
Cocoon-adult survivorship (%) | 85.0 ± 2.7 | 86.0 ± 2.2 | t = 0.29; P = 0.78 |
Sex ratio (% females) | 58.8 ± 2.3 | 57.0 ± 2.8 | t = 0.51; P = 0.62 |
Female longevity (days) | 9.7 ± 0.5 | 10.1 ± 0.6 | t = 0.53; P = 0.60 |
