Hemlock Woolly Adelgid

Scientific name: Adelges tsugae (Annand)

Common name: Hemlock Woolly Adelgid

Native To: Asia

Date of U.S. Introduction: 1920s (West Coast); 1951 (East Coast)

Images: Invasive.org and Google

Video: Impacts of the Hemlock Wooly Adelgid (or click Play button below)

Means of Introduction: Arrived accidentally in shipments from Asia

Impact: Destroys Eastern hemlock trees (Tsuga canadensis)

Current U.S. Distribution:

• National Agricultural Pest Information System - Pest Tracker - Reported Status
• Eastern U.S.; Western U.S. (not considered a pest)
• Distribution maps (including predicted future range expansion)
  USDA. FS. Northeastern Area.

Management Plans: Animals

Selected Internet Resources:

• Federal Government
• State Government
• University/Academic
• International
• Organizations

Hemlock Woolly Adelgid
DOI. National Park Service. Great Smoky Mountains.
Impacts; Controls

Adelges tsugae Article Citation Search - AGRICOLA Database
USDA. National Agricultural Library.
Research; Special Note: NAL Catalog Search (resources)

Hemlock Woolly Adelgid
USDA. FS. Northern Research Station.
Identification/Description; Photographs; Illustrations; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls; Research

Hemolock Wooly Adelgid - Biological Control
USDA. FS. Northeastern Area. Forest Health Protection.
Controls

Hemlock Woolly Adelgid - Pest Alert
USDA. FS. Northeastern Area.
Identification/Description; Photographs; Impacts; Distribution

Hemlock Woolly Adelgid
USDA. FS. Northeastern Area. State and Private Forestry.
Identification/Description; Photographs; Illustration; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls; Research; Special Note: Distribution Maps and HWA Working Group Coordinating Committee

Proceedings: Symposium on Sustainable Management of Hemlock Ecosystems in Eastern North America, Jun 22-24, 1999, Durham, New Hampshire [General Technical Report NE-267]
USDA. FS. Northeastern Research Station.
Identification/Description; Photographs; Illustrations; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls; Research

Draft Environmental Assessment for the Release and Establishment of Pseudoscymnus tsugae (Coleoptera: Coccinellidae) as a Biological Agent for Hemlock Woolly Adelgid (Adelges tsugae)
DOI. Delaware Water Gap National Recreation Area.
Photographs; Illustrations; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Impacts; Controls

Research on Decline of Eastern Hemlock (Tsuga canadensis) at the Aquatic Ecology Laboratory
DOI. USGS. Biological Resources Division. Leetown Science Center. Aquatic Ecology Laboratory.
Photographs; Impacts; Habitat; Distribution; Dispersion; Research

Hemlock Woolly Adelgid
Connecticut Agricultural Experiment Station.
Identification/Description; Impacts; Life Cycle; Dispersion; Controls

Help Keep Hemlock Woolly Adelgid out of Maine - Special Alert
Maine Department of Conservation. Maine Forest Service. Forest Health and Monitoring Division.
Photographs; Impacts; Distribution; Dispersion; Legal Aspects

Hemlock Woolly Adelgid
Pennsylvania Department of Conservation and Natural Resources. Forestry.
Identification/Description; Illustrations; Introduction History; Impacts

Hemlock Woolly Adelgid (HWA)
Ohio Department of Natural Resources. Forestry.
Identification/Description; Photographs; Introduction History

Hemlock Woolly Adelgid (PDF | 185 KB)
University of Maryland. Cooperative Extension. Home and Garden.
Identification/Description; Photographs; Impacts; Life Cycle; Distribution; Controls

Hemlock Decline in the New Jersey Highlands Region - Mapping and Monitoring Eastern Hemlock Defoliation due to the Hemlock Woolly Adelgid
Rutgers University. Grant F. Walton Center for Remote Sensing and Spatial Analysis.
Photographs; Impacts; Distribution; Dispersion

The Hemlock Woolly Adelgid: Life Cycle, Monitoring, and Pest Management in New Jersey (PDF | 193 KB)
Rutgers Cooperative Extension. New Jersey Agricultural Experiment Station.
Identification/Description; Illustrations; Impacts; Life Cycle; Distribution; Dispersion; Controls

Hemlock Woolly Adelgid - Introduced Species Summary Project
Columbia University. Center for Environmental Research and Conservation.
Taxonomy; Identification/Description; Photographs; Introduction History; Impacts; Life Cycle; Habitat; Controls

Hemlock Woolly Adelgid (PDF | 437 KB)
Cornell University. Cooperative Extension. Suffolk County.
Identification/Description; Photographs; Impacts; Life Cycle; Dispersion; Controls

Hemlock Woolly Adelgid - Ornamental and Turf Insect Note 119
North Carolina Cooperative Extension Service.
Identification/Description; Illustration; Introduction History; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls

Hemlock Woolly Adelgid - Fact Sheet: Invasive Insects (PDF | 401 KB)
Pennsylvania State University. Cooperative Extension.
Identification/Description; Photographs; Introduction History; Dispersion; Controls

Young Harris College (YHC) Hemlock Project
Young Harris College (Georgia).
Identification/Description; Photographs; Impacts; Distribution; Controls

Adelges tsugae (insect) - ISSG Global Invasive Species Database
World Conservation Union. Invasive Species Specialist Group.
Taxonomy; Identification/Description; Impacts; Life Cycle; Habitat; Distribution; Controls

Adelges tsugae
Discover Life.
Identification/Description; Photographs; Impacts; Life Cycle; Habitat; Distribution; Dispersion; Controls

Hemlock Woolly Adelgid
Invasive.org.
Photographs; Special Note: Resources

Non-Native Insect Threatens Health of Popular and Beneficial Trees - Invasive Species of Concern in Maryland
Maryland Invasive Species Council.
Impacts; Distribution

Hemlock Woolly Adelgid Action Team
Southern Appalachian Man and the Biosphere Cooperative.
Identification/Description; Photographs; Impacts; Life Cycle; Habitat; Distribution; Controls