TABLE 3.

Cross-resistance of AR to other B. thuringiensis proteins and cypermethrin

Strain	Ga	Compound	Total no. of insects testedb	LC50 (95% FL)c	Slope (mean ± SE)	RRd
AR	19 (93)	Cry1Ab	200	—h		NDe
SCf			200	133.33 (98.42-261.41)	1.82 ± 0.55
AR	15 (>100)	Vip3A	512	22.29 (15.18-31.07)	2.59 ± 0.49	0.94
SC			512	23.73 (16.82-33.80)	2.24 ± 0.35
AR	16 (>100)	Cry2Aa2	672	101.83 (72.60-167.39)	2.83 ± 0.51	1.55
SC			672	65.70 (46.27-109.34)	1.89 ± 0.27
AR	16 (>100)	Cypermethrin	288	1.70 (1.11-2.61)g	2.08 ± 0.40	1.85
SC			288	0.92 (0.61-1.33)g	2.55 ± 0.52

^aG, generations of H. zea continuously selected with B. thuringiensis protein; values in parentheses indicate the RR when bioassays were conducted.

^bThree to five replicates with five to seven concentrations.

^cLC₅₀ values are in micrograms of B. thuringiensis protein per gram of diet. FL, fiducial limits.

^dThe LC₅₀ for AR divided by the LC₅₀ for SC.

^eND, not determined because the LC₅₀ for AR could not be obtained.

^fSC, susceptible colony.

^gLethal dose (ng/mg [body weight]).

^h8.44% mortality at 400 μg/g of diet.