Table 2. Percent mortality of neonates (on leaf disk) and L2 larvae (on square) of H. armigera, H. zea and the F₁ progeny from ♀H. armigera × ♂H. zea after 5 d on leaves of Bt and non-Bt cotton technologies in laboratory trials.

Pest species and cotton technologies	n a	Leaf disk (growth stage 15)b		Leaf disk (growth stage 55)b		Square (growth stage 55)b
		Dead	% mortality (95% CI)	Dead	% mortality (95% CI)	Dead	% mortality (95% CI)
Helicoverpa armigera (Ha-Lab)
DAS-21023-5 × DAS-24236-5 × SYN-IR102-7	128	110	85.9 (79.0–91.1) a	92	71.9 (63.6–79.1) a	70	54.7 (46.0–63.1) a
DAS-21023-5 × DAS-24236-5	128	93	72.7 (64.4–79.8) a	86	67.2 (58.7–74.9) a	77	60.2 (51.5–68.3) a
Non-Bt cotton	128	3	2.3 (0.7–6.5) b	3	2.3 (0.7–6.5) b	1	0.8 (0.1–4.4) b
Helicoverpa zea (Hz-Lab)
DAS-21023-5 × DAS-24236-5 × SYN-IR102-7	128	128	100.0 (97.2–100.0) a	128	100.0 (97.2–100.0) a	128	100.0 (97.2–100.0) a
DAS-21023-5 × DAS-24236-5	128	128	100.0 (97.2–100.0) a	53	41.4 (33.1–50.0) b	70	54.7 (46.0–63.1) b
Non-Bt cotton	128	16	12.5 (7.6–19.2) b	10	7.8 (4.1–13.6) c	14	10.9 (6.4–17.3) c
F1 hybryd (♀ Ha-Lab × ♂ Hz-Lab)c
DAS-21023-5 × DAS-24236-5 × SYN-IR102-7	128	128	100.0 (97.2–100.0) a	97	75.8 (67.8–82.3) a	48	37.5 (29.5–46.1) a
DAS-21023-5 × DAS-24236-5	128	59	46.1 (37.6–54.8) b	51	39.8 (31.7–48.5) b	15	11.7 (7.0–18.2) b
Non-Bt cotton	128	14	10.9 (6.4–17.3) c	16	12.5 (7.6–19.2) c	3	2.3 (0.7–6.5) c

^aNumber of larvae tested per growth stage.

^bGrowth stage number according to Munger et al. [28]. Means (95% CI) followed by the same letter in each column and species are not significantly different due to nonoverlap of 95% CIs.

^cOnly the crossing of ♀H. armigera × ♂H. zea produced fertile eggs allowing bioassays to be carried out.