Michigan’s Major Tree Maladies for 2017

Jan 23 2017 - 9:30am

Michigan’s trees are under assault from a variety of sources. Some of the origins of these tree maladies are from lethal, invasive pests and diseases. Other causes of tree maladies are less destructive….unless we misdiagnose them and engage in inappropriate remediation efforts. Still other maladies are the direct result of human activities. Based upon past and new developments over the past several years, we can predict what issues will become prominent during 2017 and what steps we need to implement to thwart the declining health of our trees. Oak Wilt, Trellis Rust, Herbicide Toxicity, the Two-Lined Chestnut Borer, Tar Spot (yes, Tar Spot), and the Hemlock Wooly Adelgid will be a few of the topics discussed during this program.

Session Track: 


Michigan State University

David L. Roberts, Ph.D, Senior Academic Specialist
College of Agriculture and Natural Resources, Michigan State University
B.S. and M.S degrees in Plant Pathology from The Ohio State University.
PhD in Botany and Plant Pathology from Michigan State University (1982).
Director of MSU’s Plant & Pest Diagnostic Clinic from 1984-1998 (>14 years).
Current position is Senior Academic Specialist in the Deans office at MSU’s College of Agriculture and Natural Resources serving Michigan’s Nursery and Landscape Industry.
Dr. Roberts has worked on many plant issues for more than 30 years. In the 1980s, his research led to the discovery of the first bacterial wilt disease of turfgrasses in North America. Subsequently, his discovery of a Xanthomonas bacterium that controls the weed grass, annual bluegrass, on golf courses resulted in several patents with MSU. His research interests also include Herbicide Toxicity to Plants, Dutch Elm Disease, Oak Wilt, Trellis Rust and a number of other issues such as Phomopsis canker on spruce, which he discovered in the late 1980s. In 2001, Dr. Roberts began work on ash decline in southeast Michigan. His research led to the discovery of the Emerald Ash Borer. He has published hundreds of articles in peer-reviewed journals, trade magazines and MSU Extension publications. As part of his Michigan State University duties, Dr. Roberts presents many lectures and workshops around Michigan and nationally.