Hemlock Woolly Adelgid in Maine

The hemlock woolly adelgid is an invasive aphid-like insect that feeds on hemlocks. Feeding damage leads to decline and can cause mortality of affected trees.

• Hemlock Woolly Adelgid Overview in Maine


• Overview of Hemlock Woolly Adelgid Life Cycle


• How to Identify Hemlock: A quick key for identifying hemlock


• Hemlock Woolly Adelgid Fact Sheet


• Photo Gallery


• Information on the quarantine on hemlock in Maine
  • HWA Quarantine Overview
  • Movement of Hemlock Forest Products
  • Movement of Hemlock Nursery Stock or Seedlings
  • Complete Quarantine Rule


• Additional background information on the hemlock woolly adelgid
• Managing Hemlock in Northern New England Forests Threatened by Hemlock Woolly Adelgid and Elongate Hemlock Scale (PDF | 13MB)
• Slow-The-Spread Management of Hemlock Woolly Adelgid In Northern New England (PDF | 4MB)
• Silvicultural Guidelines for Management
• Environmental Assessment Regarding Management of Hemlock Woolly Adelgid Impacts In Maine
• Hemlock Woolly Adelgid Initiative Website


• Posters
  • Infested area notice (PDF | 454KB)
  • Hemlock Woolly Adelgid/Elongate Hemlock Scale Poster (PDF | 324KB)
  • Biological Control Information Sheet (PDF | 589KB)


• Volunteer: Look for Hemlock Woolly Adelgid and Report What You Find
  • Take A Stand
  • Ecosystem Investigation Network - Hemlock Woolly Adelgid