Table 1. Toxicity of different Cry toxins to S. frugiperda colonies of SfLab and SfBt.

	SfLab			SfBt
Protein	LC 50 a ng/cm 2	Slope	Standard error	LC 50 a ng/cm 2	Slope	Standard error	RR
Cry1Fa	342 (192–609)	1.3	1.0	> 3,500	-	-	> 10
Cry1Aa	73.0 (26–120)	0.0061	0.0020	2514 (1283–3745)	0.00048	0.00017	34
Cry1Ab	403 (251–647)	1.8	1.1	1636 (843–2429)	0.0010	0.00030	4.0
Cry1Ac	545 (318–771)	0.0010	0.00030	1415 (789–2040)	0.00090	0.00030	2.5
Cry2Aa	668 (424–912)	0.0020	0.00050	827 (562–1093)	0.0020	0.0010	1.2
Cry2Ab	> 3,500	-	-	> 3,500	-	-	1.0
Cry1AbMod	60 (42–86)	1.8	1.1	191 (112–326)	1.5	1.1	3.1
Cry1AcMod	44 (29–68)	1.7	1.1	249 (134–462)	1.5	1.1	5.6

^a LC₅₀ analyzed by Probit program R Core Team Software (fiducial level 95%). RR. Resistance ratio SfBt LC₅₀/LC₅₀ SfLab.