Table 1. Net reproductive rate and relative fitness of four T. ni strains on artificial diet and plant leaves.

Host plant	Parameter	T. ni strain
		Susc.a	1Ac-Rb	2Ab-Rc	1Ac2Ab-Rd
Artificial diet	NRR (R0)e	347.9	277.7	280.0	252.3
	Fitness (w)f	1.00	0.80	0.80	0.72
Cabbage	NRR (R0)e	111.2	96.2	98.7	86.7
	Fitness (w)f	1.00	0.86	0.89	0.78
Cotton	NRR (R0)e	90.8	48.7	39.7	33.1
	Fitness (w)f	1.00	0.54	0.44	0.36
Tobacco	NRR (R0)e	98.2	76.7	50.7	45.4
	Fitness (w)f	1.00	0.78	0.52	0.46
Tomato	NRR (R0)e	123.2	61.2	31.0	40.4
	Fitness (w)f	1.00	0.50	0.25	0.33

^aCornell Bt-susceptible strain.

^bGLEN-Cry1Ac-BCS strain.

^cGLEN-Cry2Ab-BCS strain.

^dGLEN-Cry1Ac+Cry2Ab-BCS strain.

^eNet reproductive rate (NRR): R₀ = N_n+1/N_n. N_n is the population quantity (neonate number) of the parent generation and N_n+1 is that of the next generation.

^fRelative fitness (w) = R₀(resistant strain)/R₀(susceptible strain).