TABLE 2.
Toxicity of Cry1Ac, Cry1Ab, B. thuringiensis subsp. kurstaki, and B. thuringiensis subsp. aizawai against the UNSEL-MEL population
| Generation | Insecticide | LC50a (95% FL) | Avg slope (SE) | RRb | nc |
|---|---|---|---|---|---|
| F3 | Cry1Ac | 0.57 (0.28–1.42) | 1.33 (0.28) | 300 | 158 |
| F9 | Cry1Ac | 0.21 (0.14–0.32) | 1.68 (0.28) | 110 | 276 |
| F3 | Cry1Ab | 0.51 (0.24–1.30) | 1.32 (0.28) | 121 | 157 |
| F9 | Cry1Ab | 0.22 (0.14–0.35) | 1.70 (0.20) | 52 | 276 |
| F4 | B. thuringiensis subsp. kurstaki | 2.18 (0.93–15.3) | 0.89 (0.32) | 40 | 196 |
| F9 | B. thuringiensis subsp. kurstaki | 0.86 (0.56–1.24) | 2.07 (0.32) | 16 | 237 |
| F4 | B. thuringiensis subsp. aizawai | 0.15 (0.12–0.20) | 4.50 (0.77) | 13 | 160 |
| F9 | B. thuringiensis subsp. aizawai | 0.10 (0.07–0.13) | 3.13 (0.47) | 9 | 271 |
a
Cry1Ac and Cry1Ab data are in micrograms per milliliter; B. thuringiensis subsp. kurstaki and B. thuringiensis subsp. aizawai data are in international units per milligram.
b
Resistance ratio of LC50s for unselected population compared with ROTH (Table 1).
c
Number of larvae used in bioassay, including control.