Savings in cost of control based on a 5-year study of 3 tree removal strategies, by 1,000-tree units.
| Year | Girdling-plus-prompt versus | Prompt versus Delayed | ||||
|---|---|---|---|---|---|---|
| Prompt | Delayed | |||||
| $ | % | $ | % | $ | % | |
| 1974 | (1.944)a | (16) | (1,063) | (9) | 881 | 8 |
| 1975 | 789 | 9 | 2,963 | 26 | 2,174 | 19 |
| 1976 | 4,002 | 26 | 10,278 | 47 | 6,276 | 29 |
| 1977 | 4,451 | 31 | 6,092 | 38 | 1,641 | 10 |
| 1978 | (2,300) | (14) | 2,120 | 10 | 4,420 | 21 |
| Total | 4,998 | 8 | 20,390 | 25 | 15,392 | 19 |
↵aBracketed numbers represent “negative savings” or losses.