[CANUFNET] Ash Species Rating

[Michael Richardson]

I think that you are likely not using a defensible approach.

Trunk Formula Method is for amenity or landscape trees.  If your trees are
in a forest or EP (Environmental Protection) than the loss is not
calculated using TFM but rather loss of environmental function and its
replacement.

The answer than may be to replace the Ash with trees that promote similar
function and add in time factors etc. as well as the cost tp control
invasive species such as European Buckthorn Control.

Cost of Cure may be the way to approach this loss.

Michael

> Hello.
>
> I would be interested in hearing from others who have dealt with appraisal
> of ash in context of EAB.
>
> A contractor has encroached on EP lands and removed vegetation, some of
> which includes ash.  Compensation will be determined using the Trunk
> Formula Method.  The municipality is in Simcoe County (Ontario) and EAB
> has been detected in several locations in the county.   ISA Ontario has
> listed the species rating for Ash as 69-75%.  Given EAB, there may be
> justification in lowering the species rating, but I am wondering what
> others have been comfortable with.
>
> Thank you.
>
> Alison
>
> Alison Bond BSc MSc BLA   OALA  CSLA
> Landscape Architect and Certified Arborist
>
> ENVISION-TATHAM Inc.
> 115 Sandford Fleming Drive, Suite 200, Collingwood, L9Y 5A6
> abond at envision-tatham.com I  Tel: 705.445.0422  I  Fax: 705.444.2327  I
> Cell: 705.994.2059 I   www.envision-tatham.com
>
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