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Charles E. Flower

Research Ecologist
Genetics, Biological Control, and Management of Invasive Species
359 Main Road
Delaware, OH 43015-8640
United States
  • University of Illinois at Chicago, Ph.D., Biological Sciences, 2013
  • The Ohio State University, M.S., Ecology, Evolution and Organismal Biology, 2007
  • Lake Forest College, B.A., Biology and History, 2004
Other Publications
Research Highlights

Forest Service scientists develop a cold-hardy American elm tree

Year: 2017
Dutch elm disease largely eradicated mature elm trees from the eastern U.S. in the 1900s. Forest Service scientists are working to create site-adapted Dutch elm disease tolerant elm trees capable of tolerating the cold winters of the Chippewa National Forest in northern Minnesota.

Identification of a clover proliferation group phytoplasma as the probable cause of American elm Ttee mortality

Year: 2017
Forest Service scientists observed premature canopy decline symptoms in elm trees within their research plantations in midsummer 2016. They attributed canopy decline symptoms to a phytoplasma in the clover proliferation group previously not reported to impact forest trees. Mitigation approaches are ...

Understanding effects of emerald ash borer on forests

Year: 2017
As the invasive emerald ash borer swept across Ohio, Forest Service researchers tracked its aftermath as killed ash trees unleashed a cascade of effects in forest ecosystems. Understanding these effects will help managers plan for and mitigate problems in forests throughout the region.

Forest Service moves American elm tree a big step closer to landscape restoration

Year: 2017
Over the past several decades, mature American elm trees have virtually disappeared from city streets and eastern forests as a result of Dutch elm disease. Forest Service scientists are on the cusp of developing sufficient genotypes to successfully restore new selections of American elm back to the ...

Genetic Information on Ash Informs Treatments for Emerald Ash Borer 

Year: 2018
Forest managers can use insecticide treatments to protect ash trees from emerald ash borer to conserve the genetic diversity of ash. But which trees should be protected? Research at the Allegheny National Forest is underway to develop new strategies to conserve ash tree diversity.

Elm Disease Resistance Research Gets a Boost

Year: 2016
Great news for disease-tolerant American elm! A grant from The Manton Foundation has provided the Forest Service’s Northern Research Station with an opportunity to accelerate American elm research in collaboration with Nature Conservancy.

Understanding Long-Term Impacts of an Invasive, Tree-Killing Pest

Year: 2019
The emerald ash borer has been killing ash trees in the United States for more than two decades. What does that mean for ash populations and the forest ecosystems? Long-term monitoring plot data collected by USDA Forest Service scientists and partners is helping to elucidate the impacts of this inva...