TABLE 1.

Toxicity and resistance ratio against Cry1Ac and Cry2Aa toxins in susceptible (YDK) and resistant (CXC and KCBhyb) H. virescens strains

Strain	Toxin
	Cry1Ac			Cry2Aa
	Slope	LC50a (95% fiducial limits)	RRb	Slope	LC50 (95% fiducial limits)	RR
YDK	0.93	0.73 (0.33-1.39)	NAc	3.31	4.30 (2.33-6.36)	NA
CXC	1.46	211.20 (104.40-343.60)	289.31	NA	No mortality at 1,000 μg/ml	>250
KCBhyb	2.00	137.00 (84.89-200.00)	187.67	NA	No mortality at 1,000 μg/ml	>250

^aLC₅₀ values are expressed in micrograms of toxin per milliliter of diet.

^bResistance ratio (LC₅₀ for resistant strain/LC₅₀ for YDK).

^cNA, not applicable.