Viability and reconstitution of delta-endotoxins from Bacillus thuringiensis var. israelensis extracts after forty years of storage against Aedes aegypti (Diptera: Culicidae)

Egyptian Journal of Biological Pest Control

Table 2 Concentration mortality response of Aedes aegypti 3rd instar larvae to Bacillus thuringiensis subsp. israelensis (Bti) reactivated strain extracts (RE) and stored extracts (SE)

*Bti* strains	LC₅₀ (mg/l) 24 h (RE)	Confidence interval 95%		LC₅₀ (mg/l) 24 h (SE)	Relative toxicity of SE
*Bti* strains	LC₅₀ (mg/l) 24 h (RE)	Lower	Higher	LC₅₀ (mg/l) 24 h (SE)	Relative toxicity of SE
3260	0.0014 ± 0.0001	0.0012	0.0016	0.12 ± 0.01	1.16
3756	0.0037 ± 0.0002	0.0035	0.0039	5.52 ± 0.19	0.06
3501	0.0852 ± 0.0026	0.0764	0.0940	1.16 ± 0.03	7.34
3691	0.0840 ± 0.0029	0.0757	0.0923	4.21 ± 0.15	1.99
3696	0.0924 ± 0.0053	0.0813	0.1035	5.2 ± 0.11	1.77