a Lethal concentrations LC50 and LC95 obtained for both strains simultaneously were used for calculating resistance ratios RR50 and RR95 of the LiTOX
Strain. LC50 and LC95 are expressed in mg L−1 for toxic leaf litter and Bti and in µL per 50 mL for each individual toxin. 95% confidence interval (CI)
limits of RR were calculated by dividing the extreme CI 95% values of lethal concentrations obtained for the LiTOX strain by those obtained for the
susceptible strain.