Table 5. Survivorship of H. zea from Bahia (Hz-field) on leaves of Bt and non-Bt cotton technologies throughout the larval cycle in laboratory trials.
| Feeding time (d) | DAS-21023-5 × DAS-24236-5 × SYN-IR102-7a | DAS-21023-5 × DAS-24236-5a | Non-Bt cottona | |||
|---|---|---|---|---|---|---|
| n | % survival (95% CI) | n | % survival (95% CI) | n | % survival (95% CI) | |
| Helicoverpa zea (Hz-field from Bahia) | ||||||
| 0 | 100 | 100.0 (96.4–100.0) a | 100 | 100.0 (96.4–100.0) a | 100 | 100.0 (96.4–100.0) a |
| 5 | 100 | 100.0 (96.4–100.0) a | 100 | 100.0 (96.4–100.0) a | 100 | 100.0 (96.4–100.0) a |
| 10 | 89 | 89.0 (81.6–94.0) a | 100 | 100.0 (96.4–100.0) a | 100 | 100.0 (96.4–100.0) a |
| 15 | 79 | 79.0 (70.2–86.1) a | 100 | 100.0 (96.4–100.0) a | 100 | 100.0 (96.4–100.0) a |
| 20 | 73 | 73.0 (63.7–81.0) b | 98 | 98.0 (93.1–99.6) a | 100 | 100.0 (96.4–100.0) a |
| 25 | 62 | 62.0 (52.2–71.1) b | 84 | 84.0 (75.8–90.1) b | 96 | 96.0 (90.4–98.6) ab |
| 30 | 37 | 37.0 (28.0–46.8) c | 68 | 68.0 (58.4–76.5) b | 84 | 84.0 (75.8–90.1) b |
aMeans (95% CI) followed by the same letter in each column for each species and cotton variety are not significantly different due to nonoverlap of 95% CIs.