Table 6.

Observed and expected mortality of F2 strain of P. xylostella treated with Cry2Ad.

Concentration of Cry2Ad (ng/ml)	Observed		Expected		χ2	P
	Dead	Alive	Dead	Alive
22.93	9	27	16	56	0.01	0.9357
45.86	13	23	22	50	0.13	0.5663
91.72	19	17	29	43	1.05	0.2222
183.44	24	12	37	35	1.70	0.1923
366.88	31	5	46	26	4.76	0.0131
∑χ2					7.65