Enhancing the insecticidal activity of new Bacillus thuringiensis X023 by copper ions

Table 1 LC₅₀ analysis of Bacillus thuringiensis X023 fermentation broth from three media

Sample	LC₅₀ (μL/mL) to P. xylostella	95% CI	LC₅₀ (μL/mL) to H. armigera	95% CI
CK	2.462	1.642−3.822	6.179	4.395−9.593
CU	1.489	1.358−1.642	4.569	3.781−5.389
Cu²⁺ sup	_	_	_	_

95% CI, 95% confidence intervals, non-overlapping 95% confidence intervals of LC₅₀ were used as the criteria to determine significant difference in toxicities among different treatments
CK fermentation broth from the original medium, CU fermentation broth from 1 × 10^-5 M Cu²⁺-added medium, Cu²⁺ sup the supernatant of CU, ^__ without toxicity

ISSN: 1475-2859