Agenda - Council - 09/22/1992 - Laserfiche WebLink

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Effect on Economics Propero' values will benefit from saving trees, and cost savings will occur from not having to remove additional dead or diseased trees. Aesthetic and actual monetar3, value of trees in residential lots will be protected. Potential losses in timber producing regions will be prevented. The benefits and costs of treatment will vary widely depending on size, value, and numbers of trees to be treated and protected, treatment method and other factors. Most benefit/cost computations are likely to be consen'ative since rate of disease spread (number of trees infected) increases from year to year without control as the area of a disease center expands. Benefits of control tend to match costs after one ),ear and are substantially greater than costs in the long term. An economic analysis developed by the Texas Forest Sen'ice in 1987 for the t)~picaI urbardwildland situation demonstrates the long term benefits of a suppression program. Assumptions: Control method: Trenching and tree removal Oak wilt center: 20 infected trees Expansion rate: 5 new trees infected per year Value: $1,000 per tree Cost of trench: $1,000 Cost of tree removal: $500 Number of healthy trees sacrificed: 5 ($5,000) .Ti.me I.nterval (Year) 0 1 2 3 4 5 Cost: $1,500 Benefit: Trees saved -5 0 5 10 15 20 Yaluesaved -$5.000 O. $5,0.00 $10,000 $15.000 $20,000 Benefit/Cost Neg. Neg. 5.5/1 6.7/1 10.0/1 153/1 Environmental Assessment: Minnesota Oak Wilt Project I ! I ! I I I I [ I [ I I I I I I