Michigan Tech School of Forest Resources and Environmental Science Welcome to the 
Ash Reduction Model

Tara L. Eberhart, Andrew J. Storer, and Linda M. Nagel

Model History

Older Model Versions

Links to EAB information

Commonly Asked Questions

Center for Exotic Species

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Insect Ecology Lab at MI Tech

Description

At high emerald ash borer (Agrilus planipennis) population densities, all green, black and white ash trees are apparently susceptible to attack and can be expected to die. Long term prospects for management include biological control to reduce population densities of the insect, and resistance or tolerance of ash trees to reduced populations of the pest. In the short term, however, reduction of pest populations in local areas is achievable by removal of its breeding substrate, phloem tissue in ash trees.  


            We have measured over 500 ash trees to find a diameter limit to remove a target percentage of phloem available to EAB.  Potential users of the model are forest resource managers that know they have ash in mixed-species stands close to outlying populations of EAB.  Use of the model will limit the population potential of EAB, thereby reducing its impact and potential spread.


            Using diameter limit cutting on ash trees in a stand allows for retention of some trees in order to help preserve ash genetics and maintain ash as a viable part of our forest.  Cutting only the biggest trees (or leaving only 1 or 2 of the biggest trees and removing the smallest ash trees) would accomplish phloem reduction and the models can help determine what size trees would best do that while removing food for EAB and still leave some ash behind.



Model Requirements

Note: These models only consider the ash component of a stand, regardless of stand size, other species present, or the total amount of ash present.  Use information from the model only for species of ash trees (Fraxinus spp.).

Input to have ready:
Trees per Acre of Ash Species-
either 1" or 2" diameter size class
Trees per Hectare of Ash Species-
either 1cm or 2cm diameter size class


General Model 2.0
General Model 2.0
Tutorial 2.0
Metric Versions
Examples 2.0
(Tutorials and examples still apply)
Click Here to Enter Data
1-inch diameter data
2-inch diameter data
Click Here to Enter Data (Metric)
1-cm diameter data
2-cm diameter data

Model for open grown trees
by species 1.4
  

Click Here to Enter Data
1-inch diameter data
2-inch diameter data


Model for forest trees
by species 1.4
 

Click Here to Enter Data

1-inch diameter data

2-inch diameter data


School of Forest Resources and Environmental Science
Michigan Technological University
1400 Townsend Drive
Houghton, MI 49931
(906) 487-3470
tleberha@mtu.edu
Copyright 2006-2010 Michigan Technological University