Table 1 Impact of Bt (Cry1Ac/Cry2Ab) cotton on life-table parameters of Cry1Ac/Cry2Ab-resistant Trichoplusia ni. Data are shown as means ± SE. Number of replications are given in parentheses.
Parameters | Non-Bt Cotton | Bt Cotton | Statistics |
|---|---|---|---|
Larval survival (%) | 95.0 | 96.0 | χ 2 = 0.65; df = 1; P = 0.72 |
Development time (d) | |||
Larva-pupation | 13.0 ± 0.2 (47) | 13.6 ± 0.2 (48) | t = 1.96; df = 93; P = 0.05 |
Pupal stage | 7.9 ± 0.1 (41) | 7.6 ± 0.1 (42) | t = 2.25; df = 81; P = 0.03 |
Pupal weight (g) | 0.23 ± 0.01 (47) | 0.22 ± 0.01 (48) | t = 0.64; df = 93; P = 0.52 |
Adult longevity (d) | 4.5 ± 0.1 (41) | 4.6 ± 0.1 (42) | t = 0.54; df = 81; P = 0.59 |
