Landscape Tree Diseases:

Oak Wilt, Dutch Elm Disease,
Ash Decline, Sudden Oak Death & More
Bringing Knowledge to Life

David L. Roberts, Ph.D.
Michigan State University Extension

Current Index:
Emerald Ash Borer - Ash Trees in Distress
  Beech Bark Disease Alert
  Beech Bark Disease USDA
  Drought Management for Trees & Shrubs
  Dutch Elm Disease
 The National Champion Buckley Elm
  Fire Blight
 Maple - Tar Spot
  Oak Wilt: A Threat to Red Oaks
 Oak Wilt: Identification and Management Guide   (.pdf format)
  Oak Wilt Photos
 Sudden Oak Death 
  White Oak & Oak Wilt
  Winter Pruning
  Winter Injury on Trees/Shrubs
 -ISA-Guidelines for Developing and Evaluating Tree Ordinances

Required for .pdf file

    Welcome to the home web page of Landscape Tree Diseases. The information contained herein represents some of the areas with which I have developed an interest, whether of an Extension (university outreach) or a research nature. As a Plant Pathologist, my obvious area of expertise is plant disease. Over the years, my direction has changed somewhat from general disease/diagnostic efforts to the more economically important diseases. Hence, the objective of this web site is to provide you with information on economically important or lethal diseases on often extremely valuable plants.

     Trees represent some of the most valuable plants in landscapes and nurseries. Trees are often valued in the $10,000's whether property value or removal costs are considered.  In the landscape, trees are often quite large and many have been growing for well over 100 years. Some of them were growing at the time of the American Civil War when Lincoln was President and/or during other significant times in American history. While most people value their trees and would do anything to save them, we, as humans, often unknowingly and unintentionally, do things which threaten their very existence. By providing this information on this site, I hope that trees will receive the respect and  consideration they truly deserve. If the information provided in this web site saves even one tree from destruction, I will feel that I have succeeded in my objective.

     I would like to recognize and thank Sandi Rosa who designed and administers this site. Without her valuable assistance, this site would not have been feasible.  If you have any comments or questions, please feel free to email either one of us.

Sites Under Construction:  All MSU Extension web sites will be updated to a new web format and url location.
This site is still under construction and a link will be placed here once available, thus this url will change as well.
If you are unable to connect to my historical data links please use: web1 in place of the www in my old url address.
Example old url:  
is now:
Sorry for the inconvenience.   




MSU Landscape Crop Advisory Team (CAT) Newsletters - Various Articles by Dr. Roberts

Archive collection of media files on Emerald Ash Borer noteworthy news materials.
 Detroit Free Press: 4/18/02  "From his office at Tollgate Education Center in Novi, plant pathologist Dave Roberts is busy fielding calls from professional arborists, city foresters and home owners, all worried about the health of their ash trees..."
Detroit Free Press: 9/21/01  "Borers attack ailing ash trees"
Detroit News: 9/4/01   "The trouble with ash trees"
Detroit Free Press: 9/3/01  "Ash trees in the area mysteriously dying"
Detroit Free Press: 2/18/00 "Something is killing the majestic oak..."
Associated Press: 9/25/00  "Experts worry oak wilt ...spreading"
Detroit Free Press: 8/17/00 "Protecting the beech tree: bark disease..."
Awards: *2000 President's Award, "for Contribution to the Landscape Industry," by Metropolitan Detroit Landscape Association, now Michigan Green Industry Association MGIA
 *Michigan State University Nursery/Landscape & Ornamental Team "for Leadership"
 *Michigan Arborists Association  "for the advancement of education programs in Arboriculture" 
Member: MSU Nursery/Landscape & Ornamental Area of Expertise Team 
The American Phytopathological Society (APS)
Staff Support:

Sandi Rosa, Administrative Assistant & Web Administrator
  Michigan State University Extension Southeast 
  Sandi implemented this educational site as an outreach effort to encompass the web audience.  She enjoys working with digital photography and the chance to create graphic designs, and is studying to further enhance her web publishing skills. 
Contact:  David L. Roberts, Ph.D.
   Michigan State University Extension Southeast
   28115 Meadowbrook Rd., Novi, MI  48377-3128 
    Michigan State University
    B17 Plant & Soil Sciences
    East Lansing, MI  48824-1359

  Email David Roberts at:  with any comments or questions.

Credits &

 Dave's photo courtesy Diane Lacy of  Diane Lacy Photography.

All photos contributed by Dr. Roberts unless otherwise noted.

Copyright and Permissions
  Copyright 2001, Michigan State University Permission is hereby granted to reproduce and distribute copies of material and/or photos from this Michigan State University Extension  web site  for nonprofit educational or library purposes, provided that copies are distributed at or below cost, and that the author, source, and copyright notice is included on each copy, print, or digital image downloaded from this site.  Dr. Roberts retains copyright to these images with request that you please acknowledge use with a statement such as "Photo or materials courtesy of Dave Roberts, Ph.D. of Michigan State University at (list web source page)" as a caption reference in your publication resource. 
This permission is in addition to rights of reproduction granted under Sections 107,108 and other provisions of the U.S. Copyright Act.

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