Table 2.

Dominance of Cry3Bb1 resistance in field strains of western corn rootworm

	Corrected larval survival on Cry3Bb1 corna
Sets of rootworm strains	Res.b	R♂×S♀	R♀×S♂	Sus.c	hd	RRe
Central Iowa	0.66* (0.24)	0.19 (0.05)	0.17 (0.12)	0.05* (0.02)	0.23	13.2
Eastern Iowa	0.55* (0.10)	0.30 (0.07)		0.05* (0.02)	0.50	11.0
Northern Iowa	0.96 (0.42)	0.59 (0.11)	0.48 (0.13)	0.05* (0.02)	0.54	19.2
Western Iowa	0.68* (0.16)	0.12 (0.08)	0.08 (0.03)	0.05 (0.02)	0.08	13.6

^aMean value with standard error given in parentheses.

^bLarval survival of resistant parents followed by an asterisk were significantly higher than F1 hybrids.

^cLarval survival of susceptible parents followed by an asterisk were significantly lower than F1 hybrids.

^dDominance of Cry3Bb1 resistance, h = (Pooled F1 hybrids-Susceptible) ÷ (Resistant-Susceptible).

^eRR denotes resistant ratio, which is the larval survivorship of resistant parents divided by average larval survivorship for susceptible parents.