Table 3. Damage ratings of corn lines infested with ACB at V6 whorl stage.
| Hybrids | Leaf feeding ratings | Tunnels /100 Plants | ||||||
|---|---|---|---|---|---|---|---|---|
| 2013 | 2014 | 2013 | 2014 | |||||
| Spring corn | Summer corn | Spring corn | Summer corn | Spring corn | Summer corn | Spring corn | Summer corn | |
| Zh58Z31 | 7.5±0.2 a | 5.8±0.2 a | 6.6±0.3 a | 6.7±0.0 a | 78.9±8.2 a | 98.9±5.7 a | 35.8±4.8 a | 108.0±7.8 a |
| Zh58Ie | 1.4±0.1 b | 1.4±0.1 bc | 1.3±0.1 b | 1.5±0.0 c | 15.6±4.6 b | 12.2±0.0 c | 14.0±4.0 b | 56.7±8.7 b |
| Z31Ac | 1.4±0.2 b | 1.7±0.1 b | 1.5±0.0 b | 1.9±0.1 b | 18.9±3.8 b | 39.4±5.2 b | 8.9±1.1 b | 37.0±15.3 b |
| AcIe | 1.0±0.0 b | 1.2±0.0 c | 1.3±0.1 b | 1.5±0.1 c | 8.9±1.4 b | 12.2±2.8 c | 12.1±1.1 b | 22.3±8.7 b |
| F | 553.23 | 321.69 | 291.60 | 1299.84 | 40.52 | 92.56 | 14.54 | 12.62 |
| df | 3, 20 | 3, 20 | 3, 8 | 3, 8 | 3, 20 | 3, 20 | 3, 8 | 3, 8 |
| P | <0.0001 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | <0.0001 | 0.0013 | 0.0021 |
The mean±SE in the same column followed by the same letter were not significantly different by Fisher’s Protect LSD test (P ≥ 0.05). The Zh58Z31 corn line is a hybrid of the non-transgenic counterpart lines Zong 31 (Z31) and Zheng 58 (Zh58) was used as a negative control. The Zh58Ie corn line is a hybrid that only expresses Cry1Ie. The Z31Ac corn line is a hybrids that only expresses Cry1Ac. The AcIe corn strain, is a hybrid that expresses both Cry1Ac and Cry1Ie.