Table 2. Responses to Bt toxin Cry1Ac of pink bollworm larvae from the Yangtze River Valley from 2008 to 2010.

Year	Population	Map ref.a	Slope	LC50	95% fiducial limits			Survival (%)c
				µg /ml	Lower	Upper	RRb
2008	Jianyang	1	1.4	0.25	0.19	0.32	2.5	0.0
	Qianjiang	5	1.5	0.33	0.18	0.50	3.3	0.0
	Tianmen	6	1.1	0.21	0.04	0.44	2.1	1.6
	Wuhan	7	1.3	0.42	0.20	0.72	4.2	1.8
	Huanggang	8	1.6	0.39	0.31	0.49	3.9	0.0
	Changde	10	1.5	0.92	0.67	1.21	9.1	3.6
	Anxiang	11	1.9	0.38	0.19	0.62	3.8	0.0
	Anqing	14	1.3	0.26	0.19	0.33	2.6	0.0
	QJ-S		3.0	0.10	0.06	0.14	1.0	0.0
2009	Jianyang	1	0.9	0.28	0.15	0.44	2.4	5.4
	Qianjiang	5	1.2	1.73	0.43	8.35	14.6	3.6
	Tianmen	6	1.2	1.24	0.04	9.82	10.5	1.8
	Huanggang	8	1.5	0.12	0.07	0.17	1.0	0.0
	Changde	10	1.7	0.17	0.00	0.44	1.4	0.0
	Anxiang	11	1.6	0.54	0.38	0.71	4.6	0.0
	Pengze	13	0.8	0.12	0.04	0.21	1.0	8.6
	Anqing	14	1.1	0.26	0.00	0.70	2.2	1.6
	QJ-S		1.4	0.12	0.06	0.19	1.0	0.0
2010	Jianyang	1	1.4	0.33	0.25	0.41	2.6	0.0
	Jianli	4	1.5	1.30	0.88	1.84	10.3	4.1
	Qianjiang	5	2.3	0.17	0.08	0.26	1.4	0.0
	Tianmen	6	1.2	0.29	0.22	0.37	2.3	1.8
	Huanggang	8	1.1	0.38	0.26	0.52	3.0	1.6
	Taoyuan	9	1.0	0.27	0.10	0.52	2.1	0.0
	Changde	10	1.8	0.52	0.40	0.65	4.1	0.0
	Anxiang	11	1.7	0.33	0.17	0.53	2.6	1.1
	Yueyang	12	1.6	0.53	0.38	0.70	4.2	3.3
	Pengze	13	1.4	0.44	0.34	0.55	3.4	5.4
	Anqing	14	1.6	0.56	0.44	0.71	4.5	5.6
	QJ-S		2.0	0.13	0.12	0.18	1.0	0.0

^aSee Fig. 2 for locations indicated by map reference numbers.

^bRR (Resistance ratio)  =  LC₅₀ of strain/LC₅₀ of the susceptible lab strain QJ-S.

^cAdjusted survival at a diagnostic concentration of Cry1Ac (see Methods).