Southern Research Station

Title: Root disease and exotic ecosystems: implications for long-term site productivity

Author: Otrosina, W.J.; Garbelotto, M.

Date: 1998

Source: Root and butt rots of forest trees; 9th international conference on root and butt rots; 1997 September 1-7; Carcans-Maubuisson, France. Les Colloques, France: [Publisher unknown]: p. 275-283.

Station ID: --

Description: Root disease fungi, particularly root-rotting Basidiomycetes, are key drivers of forest ecosystems. These fungi have co?evolved with their hosts in various forest ecosystems and are in various states of equilibrium with them. Management activities and various land uses have taken place in recent times that have dramatically altered edaphic and environmental conditions under which forest tree species and ecosystems have evolved. For example, in Sequoia giganteun stands, fire suppression in this fire-dependent ecosystem has resulted in increased mortality due to Heterobasidion annosum. On [One] hypothesis is that fire suppression results in increased encroachment of true firs, readily infected by S group H. annosum, thereby transferring the disease via root contacts with S. giganteum. Also, the existence of a hybrid between the S and P ISG's of H. annosum may be evidence for anthropogenic influences on evolutionary pathways in this pathogen. In other ecosystems, such as Pinus palustris (longleaf pine) in the Southeastern United States, increased mortality following prescribed fire is being observed. Various Leptographium species and H. annosum have been associated with this motility following relatively cool temperature fires, but how these fungi interact with fire and various edaphic factors are not known. Past agricultural practices that resulted in extensive soil erosion may have given rise to an "exotic ecosystem" in which longleaf pine is now maladapted.

Keywords: 

View and Print this Publication (288 KB)

Pristine Version:  An uncaptured or "pristine" version of this publication is available. It has not been subjected to OCR (Optical Character Recognition) and therefore does not have any errors in the text. However it is a larger file size and some people may experience long download times. The "pristine" version of this publication is available here:

View and Print the PRISTINE copy of this Publication (3.2 MB)

Publication Notes: 

• We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
• This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.
• You may send email to pubrequest@fs.f ed.us to request a hard copy of this publication. (Please specify exactly which publication you are requesting and your mailing address.)

 Get the latest version of the Adobe Acrobat reader or Acrobat Reader for Windows with Search and Accessibility

Citation

Otrosina, W.J.; Garbelotto, M.  1998.  Root disease and exotic ecosystems: implications for long-term site productivity.   Root and butt rots of forest trees; 9th international conference on root and butt rots; 1997 September 1-7; Carcans-Maubuisson, France. Les Colloques, France: [Publisher unknown]: p. 275-283.