An A to Z List of Invasive Threats to Forests and Trees

Invasive species are among the biggest threats to the health of our forests and trees today. Here we provide a short list of pests and pathogens that you can help us look out for. 

Some, marked with *, are readily identified this time of year. For others, this is a great time to learn so that you are ready to identify these issues when spring arrives. 

• * Asian Longhorned Beetle (Hardwoods) *
• * Beech Leaf Disease (American Beech) *
• Beech Leaf Mining Weevil (American Beech)
• * Browntail Moth (Hardwoods) *
• * Emerald Ash Borer (Ash Trees) *
• * Hemlock Woolly Adelgid (Hemlocks) *
• Jumping Worms (Forests)
• Oak Wilt Disease (Oaks)
• * Red Pine Scale (Red Pine) *
• Winter Moth (Hardwoods)
• Elm Zigzag Sawfly (Elms)
• Report a Forest Pest or Pathogen!