Effect of air temperature on injectability of mature elm trees.
| Air temperature (C) | ||||||
|---|---|---|---|---|---|---|
| 18 | 19-21 | 22-24 | 25-27 | 28-30 | 31 | |
| Mean time per tree | ||||||
| 1981 | ||||||
| Time (hr) | 4.4 | 3.0 | 3.0 | 3.1 | 2.1 | 1.4 |
| No. of trees | 3 | 10 | 14 | 8 | 6 | 7 |
| 1982 | ||||||
| Time (hr) | 3.0 | 3.1 | 2.8 | 2.5 | 1.9 | 2.1 |
| No. of trees | 3 | 11 | 22 | 32 | 9 | 6 |
| Two-year average | ||||||
| Time (hr) | 3.7 | 3.1 | 2.9 | 2.8 | 2.0 | 1.8 |