Table 2.
Results from greenhouse bioassays on the effects of rice variety, nitrogen level and plant age on Nilaparvata lugens fitness parameters.
| Variety | Nitrogen level (kg ha−1) | Plant age (DAS) | Xylem as a proportion of total honeydew | Nymph survival (%) | Nymph development (% adults)a | Nymph biomass (mg plant−1) | Number of eggs per plant |
|---|---|---|---|---|---|---|---|
| IR22 | |||||||
| 0 | 15 | 0.16 (0.07) | 68.33 (12.24) | 100.00 (0.00) | 7.13 (1.77) | 89.33 (20.02) | |
| 0 | 30 | 0.01 (0.01) | 85.00 (5.00) | 100.00 (0.00) | 8.54 (0.80) | 140.67 (24.77) | |
| 0 | 45 | 0.34 (0.21) | 76.67 (7.15) | 100.00 (0.00) | 7.21 (1.02) | 176.75 (14.10) | |
| 60 | 15 | 0.17 (0.13) | 65.00 (15.44) | 100.00 (0.00) | 6.12 (1.81) | 152.67 (16.38) | |
| 60 | 30 | 0.01 (0.01) | 76.67 (16.06) | 100.00 (0.00) | 10.92 (2.61) | 161.00 (18.63) | |
| 60 | 45 | 0.06 (0.05) | 80.00 (6.83) | 100.00 (0.00) | 10.09 (0.79) | 144.20 (18.63) | |
| 150 | 15 | 0.22 (0.10) | 65.00 (9.57) | 100.00 (0.00) | 6.53 (1.52) | 123.80 (21.28) | |
| 150 | 30 | 0.04 (0.04) | 91.67 (5.43) | 100.00 (0.00) | 11.03 (0.86) | 179.00 (27.75) | |
| 150 | 45 | 0.18 (0.18) | 95.00 (3.42) | 100.00 (0.00) | 13.24 (0.55) | 145.00 (26.85) | |
| IR62 | |||||||
| 0 | 15 | 0.70 (0.18) | 88.33 (11.95) | 100.00 (0.00) | 6.44 (0.86) | 105.00 (17.38) | |
| 0 | 30 | 0.80 (0.20) | 83.33 (7.15) | 89.68 (6.55) | 4.79 (0.97) | 86.00 (25.81) | |
| 0 | 45 | 0.89 (0.11) | 15.00 (9.57) | 11.11 (11.11) | 0.24 (0.18) | 42.50 (9.92) | |
| 60 | 15 | 0.75 (0.16) | 78.33 (8.72) | 95.83 (4.17) | 5.90 (0.50) | 154.50 (19.50) | |
| 60 | 30 | 0.77 (0.15) | 36.67 (11.16) | 65.95 (17.21) | 2.08 (0.71) | 88.40 (20.51) | |
| 60 | 45 | 0.24 (0.19) | 26.67 (12.29) | 21.88 (12.88) | 0.67 (0.34) | 87.75 (22.80) | |
| 150 | 15 | 0.08 (0.08) | 83.33 (5.58) | 100.00 (0.00) | 7.65 (0.87) | 102.00 (30.00) | |
| 150 | 30 | 0.51 (0.21) | 86.67 (9.55) | 97.22 (2.78) | 4.20 (0.68) | 130.50 (32.40) | |
| 150 | 45 | 0.31 (0.13) | 56.67 (15.20) | 76.17 (12.96) | 3.27 (1.63) | 68.50 (9.25) | |
| Rank | arcsine | None | Rank | lg(sqrt) | |||
| F-variety (V) | 1 | 59.749*** | 11.229*** | 82.524*** | 62.158*** | ||
| F-nitrogen (N)b | 2 | 2.468 ns | 5.103** | 38.240*** | 4.746* | 6.592** | |
| F-age (A)b | 2 | 1.264 ns | 5.611** | 10.846*** | 1.396 ns | 5.356** | |
| F-V × Nb | 2 | 4.401* | 1.214 ns | 1.271 ns | 1.269 ns | ||
| F-V × A | 2 | 8.357*** | 16.167*** | 22.944*** | 19.082*** | ||
| F-N × Ab | 4 | 1.621 ns | 2.643* | 4.556** | 1.811 ns | 2.987* | |
| F-V × N × Ab | 4 | 1.569 ns | 0.786 ns | 0.651 ns | 3.834** | ||
| Error | 90 | ||||||
a
denominator df = 38.
b
ns = P > 0.05.
*
=P ≤ 0.05.
**
=P ≤ 0.01.
***
=P ≤ 0.001.