Ratio of total discounted costs associated with emerald ash borer management per meter of trunk diameter of standing trees after implementing selected emerald ash borer management strategies for 25 years in a 1,600-tree forest. The model assumes a 3% discount rate and treating ash trees every three years through the crest of the EAB invasion wave and every five years thereafter. Reduction is the decrease in the ratio when the cost of treatment is reduced from $3.94 to $1.97 per cm dbh. Currency is in $USD.
| Time step of initiation | Year 1 | Year 5 | ||||
|---|---|---|---|---|---|---|
| Cost ($USD) per cm for treatment | $3.94 | $1.97 | Reduction (%) | $3.94 | $1.97 | Reduction (%) |
| Reactively replace | $1,758.28 | $1,758.28 | 0.00 | $1,933.32 | $1,933.32 | 0.00 |
| Proactively replace | $2,178.42 | $2,178.42 | 0.00 | $1,983.20 | $1,983.20 | 0.00 |
| Treat >30 cm dbh | $973.60 | $641.19 | 34.14 | $981.56 | $625.40 | 36.28 |
| Treat 50% | $1,176.18 | $883.30 | 24.90 | $1,148.08 | $886.33 | 22.80 |
| Treat 80% | $1,050.47 | $677.67 | 35.49 | $962.17 | $648.75 | 32.57 |
| Treat all | $1,056.88 | $592.97 | 43.89 | $952.74 | $579.32 | 39.19 |