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Table III
Survival rate and mass loss against Reticulitermes speratus in 2 weeks of observation of teakwood by age and radial position. Mean of 5 trees (8 and 51 years old) and 4 trees (30 years old), with the standard deviation parentheses. The same letters in the same column are not significantly different at p < 5% by Duncan’s test.
| Tree age (y) | Position | Survival rate (%) | Mass loss (mg) | |
|---|---|---|---|---|
| First week | Second week | |||
| 8 | Outer sapwood | 82.72 (16.42) a | 55.85 (24.68)a | 27.68 (8.05) d |
| Inner sapwood | 84.00 (16.49) a | 47.50 (29.33) a | 31.81(14.78) d | |
| Outer heartwood | 57.00 (22.81) b | 37.66 (23.18) b | 7.45 (5.39) b | |
| Outer sapwood | 70.60 (13.92) a | 24.33 (18.56) b | 14.52 (6.78) c | |
| Inner sapwood | 70.66 (14.24) a | 24.18 (22.60) b | 7.84 (6.23) b | |
| 30 | Outer heartwood | 59.55 (18.43) b | 29.81 (21.09) b | 4.07 (3.32) ab |
| Middle heartwood | 58.18 (12.85) b | 28.83 (16.56) b | 3.18 (2.71) ab | |
| Inner heartwood | 54.60 (25.22) b | 25.81 (13.15) b | 5.69 (4.36) ab | |
| Outer sapwood | 58.42 (19.28) b | 23.73 (15.15) b | 6.30 (4.34) ab | |
| 51 | Outer heartwood | 53.28 (13.09) b | 27.20 (13.81) b | 1.37 (1.06) a |
| Middle heartwood | 44.66 (15.35) b | 27.60 (9.89) b | 1.39 (1.22) a | |
| Inner heartwood | 54.53 (25.52) b | 31.33 (14.57) b | 4.72 (3.46) ab | |
| Pine control | 96.67 (1.15) | 88.67 (2.30) | 52.41 (5.69) | |
| Starvation | 58.0 (4.0) | 16.6 (13.3) | - | |