Table 2. Effects of maize type and sampling time on natural enemy abundance in 2012 and 2013.
| Total abundance | Year | Non-Bt maize | Bt maize | Maize type |
Sampling time |
Maize type × Sampling time |
|||
|---|---|---|---|---|---|---|---|---|---|
| F | P | F | P | F | P | ||||
| Whole plant inspections | 2012 | 132.80 ± 22.34 | 131.17 ± 20.98 | 0.64 | 0.4602 | 48.58 | <0.0001 | 1.11 | 0.3816 |
| 2013 | 96.2 ± 9.60 | 77.97 ± 6.23 | 4.59 | 0.0850 | 7.50 | <0.0001 | 1.28 | 0.2817 | |
| Pitfall traps | 2012 | 29.08 ± 5.62 b | 40.42 ± 8.39 a | 14.98 | 0.0118 | 19.46 | <0.0001 | 2.97 | 0.0785 |
| 2013 | 70.5 ± 2.48 | 72.33 ± 4.41 | 1.75 | 0.2437 | 21.13 | <0.0001 | 1.94 | 0.1813 | |
| Suction sampler | 2012 | 20.92 ± 5.30 | 19.75 ± 4.38 | 0.30 | 0.6090 | 8.62 | 0.0031 | 0.20 | 0.8943 |
| 2013 | 20.17 ± 3.08 | 21 ± 4.51 | 0.13 | 0.7218 | 8.00 | 0.0042 | 1.01 | 0.4276 | |
All data were analyzed using a 2-way unequally spaced repeated-measure ANOVA. Values highlighted in bold are statistically significant (P < 0.05). Values for Bt and non-Bt maize followed by the different lowercase letters within a row are significantly different using t-tests (P < 0.05).