Table 4. Survivorship of H. armigera (Ha-Lab) and H. zea (Hz-Lab) 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 armigera (Ha-Lab) | ||||||
| 0 | 420 | 100.0 (99.2–100.0) a | 260 | 100.0 (98.6–100.0) a | 130 | 100.0 (97.3–100.0) a |
| 5 | 104 | 25.0 (21.0–29.3) b | 112 | 42.4 (36.6–48.4) b | 121 | 89.0 (82.8–93.4) b |
| 10 | 46 | 11.1 (8.3–14.4) c | 76 | 28.8 (23.6–34.5) c | 112 | 82.3 (75.2–88.0) b |
| 15 | 23 | 5.5 (3.7–8.1) d | 25 | 9.5 (6.4–13.5) d | 91 | 67.0 (58.7–74.4) c |
| 20 | 13 | 3.1 (1.8–5.2) de | 10 | 3.8 (2.0–6.7) de | 84 | 61.8 (53.4–69.6) c |
| 25 | 8 | 2.0 (0.9–3.7) de | 3 | 1.1 (0.3–3.2) ef | 75 | 55.1 (46.7–63.3) c |
| 30 | 3 | 0.7 (0.2–2.1) e | 0 | 0.0 (0.0–1.4) f | 71 | 52.2 (43.8–60.5) c |
| Helicoverpa zea (Hz-Lab) b | ||||||
| 0 | 420 | 100.0 (99.2–100.0) a | 260 | 100.0 (98.6–100.0) a | 130 | 100.0 (97.3–100.0) a |
| 5 | 0 | 0.0 (0.0–0.01) b | 151 | 58.1 (52.0–63.9) b | 111 | 85.4 (78.5–90.6) 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.
bThe evaluations were performed only up to 5 d, as there was complete mortality of the Hz-Lab population on leaves of DAS-21023-5 × DAS-24236-5 × SYN-IR102-7 cotton.