Table 6.
Mean of entry by season interactions and main effects amongst three sets of entries (Bt hybrids, non-Bt near isogenic hybrids and non-Bt commercial checks) averaged across season and across all Bt hybrids, non-Bt hybrids and across the commercial checks. Mean values with the same letter in a column are not significantly different using the least significance difference (LSD) at P = 0.05.
| Season | Entry∗ | Grain yield (t ha−1) (±SEM) | Number holes/plant (±SEM) | % Stem height tunnelled (±SEM) |
|---|---|---|---|---|
| 1 | Bt | 6.4 ± 0.4ab | 0.4 ± 0.3a | 0.7 ± 0.3a |
| Non-Bt | 5.7 ± 0.4ab | 2.7 ± 0.3c | 3.8 ± 0.3c | |
| Checks | 5.0 ± 0.5a | 2.8 ± 0.5c | 5.0 ± 0.4d | |
| 2 | Bt | 11.7 ± 0.4d | 1.7 ± 0.3b | 0.1 ± 0.3a |
| Non-Bt | 7.2 ± 0.4bc | 4.0 ± 0.3d | 3.9 ± 0.3c | |
| Checks | 5.9 ± 0.5ab | 4.9 ± 0.5d | 4.8 ± 0.4d | |
| 3 | Bt | 11.0 ± 0.4d | 0.03 ± 0.3a | 0.07 ± 0.3a |
| Non-Bt | 6.9 ± 0.4ab | 1.5 ± 0.3b | 2.1 ± 0.3b | |
| Checks | 7.0 ± 0.5bc | 2.1 ± 0.5b | 3.4 ± 0.4c | |
| Mean entry | Bt | 9.7 ± 0.2c | 0.7 ± 0.2a | 0.3 ± 0.1a |
| Non-Bt | 6.9 ± 0.2b | 2.8 ± 0.2b | 3.7 ± 0.1b | |
| Checks | 6.0 ± 0.3a | 3.3 ± 0.2c | 4.7 ± 0.2c | |
| Mean season | 1 | 5.8 ± 0.2a | 2.0 ± 0.2b | 3.3 ± 0.2b |
| 2 | 8.3 ± 0.2b | 3.6 ± 0.2c | 3.1 ± 0.2b | |
| 3 | 8.4 ± 0.2b | 1.2 ± 0.2a | 2.3 ± 0.2a |
*Entry Bt = Bt hybrids; Non-Bt = Non-Bt near isogenic hybrids; Checks = Commercial checks.