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Threats to Trees and Forests
 Photo of tree killed  by Emerald Ash Borer
Green ash killed by EAB showing 
D-shaped exit holes 
(Photo by David Roberts, Michigan State University)
Throughout Loudoun County, there are a number of potential threats to trees in forests and in urban areas. These include pests and diseases, invasive plants, wildfires, and extreme weather events.

  • Current & Recent Hydrologic Conditions: The Loudoun County Government's Water Resources Monitoring Program collects and analyzes hydrological data specific
    to Loudoun. 
  • Weekly Drought Map: Maps showing current and predicted drought, which can stress trees and increase wildfire risk. 

Forest Fires
  • Firewise: A community program to reduce the risk of wildfires to your home and community. 
  • Fire Danger Rating Map: A U.S. Forest Service map showing current wildfire risk 

Pests and Diseases
  • Diagnosing Plant Problems: A systematic process for identifying problems with trees and other plants.
  • Loudoun County Master Gardeners: Trained volunteers who can help identify common pests and problems with trees and ornamental plants.
  • Don’t Move Firewood: Prevent the spread of insects and diseases that could devastate Loudoun’s forest resources by always buying firewood locally. 
  • Forest Threat Summary Viewer: Provides images, distribution maps, web links, extension and state contact information, and brief and detailed descriptions about specific forest threats in the eastern United States.
  • U.S. Forest Service Pest Alerts: Fact sheets on major pests affecting forests throughout the United States.

Pests of Serious Concern 
The following tree pests pose a serious threat to trees in Loudoun County, and can severely weaken or kill affected species:

Diseases of Serious Concern

Invasive Plant Species
Plants introduced from other areas without native predators, can outcompete and displace native species. These plants can increase fire risk, reduce the health and value of trees, and reduce the quality of wildlife habitat.

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