TABLE 1.
Toxicities of different B. thuringiensis toxins toward S. exigua and S. frugiperdaa
| Toxin | Insect | LC50 (ng/cm2)b | Slope |
|---|---|---|---|
| Cry1Ac | S. exigua | >2,000 | |
| S. frugiperda | >2,000 | ||
| Cry1Bb | S. exigua | 1,468 (1,035–3,750) | 3.3 |
| S. frugiperda | 308 (233–393) | 3.9 | |
| Cry1Ca | S. exigua | 127 (49–187) | 4.6 |
| S. frugiperda | 1,144 (813–3,227) | 3.5 | |
| Cry1Fa | S. exigua | 177 (96–247) | 4.4 |
| S. frugiperda | 109 (31–168) | 4.6 | |
| I-labeled Cry1Bb | S. frugiperda | >1,500 | |
| I-labeled Cry1Ca | S. exigua | 242 (165–373) | 4.2 |
| I-labeled Cry1Fa | S. exigua | 923 (676–1,830) | 3.3 |
| S. frugiperda | 608 (488–844) | 3.5 |
a
LC50, 95% confidence intervals, and slopes were calculated by using data from two bioassay experiments.
b
Nanograms of protein per square centimeter of artificial diet. The values in parentheses are 95% confidence intervals.