Table 5. Survival of S. frugiperda on leaf discs of different Bt and non-Bt maize plants.
| Entry | Survival (%) | Larval stage of survivors | Weight (mg) a | WR (%) b | ||
|---|---|---|---|---|---|---|
| L1 | L2 | L3 | ||||
| RR strain | ||||||
| Cry1A-P | 80.0 ± 8.6 b | 90.6 ± 5.8 | 9.4 ± 5.8 | 0.0 ± 0.0 | 1.9 ± 0.3 | 75.7 |
| Cry2A-P | 1.6 ± 1.6 c | 100.0 ± 0.0 | 0.0 ± 0.0 | 0.0 ± 0.0 | n.a | n.a |
| TC 1507 (Cry1F) | 98.4 ± 1.6 a | 0.0 ± 0.0 | 7.0 ± 3.4 | 93.0 ± 3.4 | 8.0 ± 1.2 | 0.0 |
| MON 810 (Cry1Ab) | 98.4 ± 1.6 a | 0.0 ± 0.0 | 0.0 ± 0.0 | 100.0 ± 0.0 | 8.8 ± 0.4 | 0.0 |
| Non-Bt maize | 100.0 ± 0.0 a | 0.0 ± 0.0 | 1.7 ± 1.7 | 98.3 ± 1.7 | 7.6 ± 2.6 | n.a |
| SS strain | ||||||
| Cry1A-P | 0.0 ± 0.0 c | n.a | n.a | n.a | n.a | n.a |
| Cry2A-P | 0.0 ± 0.0 c | n.a | n.a | n.a | n.a | n.a |
| TC 1507 (Cry1F) | 0.0 ± 0.0 c | n.a | n.a | n.a | n.a | n.a |
| MON 810 (Cry1Ab) | 61.6 ± 4.3 b | 0.0 ± 0.0 | 13.8 ± 4.6 | 86.2 ± 4.6 | 4.3 ± 0.4 | 40.5 |
| Non-Bt maize | 90.0 ± 4.9 a | 0.0 ± 0.0 | 8.4 ± 5.2 | 91.6 ± 5.2 | 7.2 ± 0.5 | n.a |
Values represent means ± SE. A separate ANOVA (Tukey’s test, P≤0.05) was conducted for treatments within each column (means followed by the same letter in column are not significantly different).
a Mean weight of survivors.
b Weight reduction compared to control (non-Bt).
n.a. Not applicable