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You are here: Home / Animals / Species Profiles / Hemlock Woolly Adelgid
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Species Profiles

Hemlock Woolly Adelgid

Hemlock Woolly AdelgidScientific name: Adelges tsugae (Annand)

Common name: Hemlock Woolly Adelgid

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Spotlight:

  • Forest Fungus Factory (May 5, 2011)
    University of Vermont.
    Hemlock is the third most common tree species in Vermont. But it soon may drop off the list, going the way of the now-vanished chestnut and elm due to the hemlock wooly adelgid. The adelgid recently arrived in southern Vermont. Scientists have been developing a novel method of putting an insect-killing fungus, lecanicillium muscarium, to work protecting hemlock trees. Field trials reduced the growth rate of adelgid by fifty percent.


Native To: Japan (Orwig et al. 2003)

Date of U.S. Introduction: Discovered on the West Coast in the 1920s, but it is disputed whether this was an introduced or native population; an introduced population was discovered on the East Coast in the 1950s (Havill et al. 2006; Orwig et al. 2003)

Means of Introduction: Accidental (Wallace and Hain 2006)

Impact: Destroys Eastern hemlock trees (Tsuga canadensis) (Orwig et al. 2003)

Current U.S. Distribution:

Images:

Video:

Selected Internet Resources:

Federal Government

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

Conservation in a Changing Climate: Hemlock Woolly Adelgid
DOI. Fish and Wildlife Service. Northeast Region.
Photographs; Introduction History; Impacts; Distribution

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

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State Government

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

Hemlock Woolly Adelgid In Maine
Maine Department of Conservation. Maine Forest Service. Forest Health and Monitoring Division.
Photographs; Impacts; Distribution; Dispersion; Legal Aspects

Hemlock Woolly Adelgid
Maryland Department of Agriculture.
Identification/Description; Introduction History; Impacts; Distribution

Hemlock Woolly Adelgid
Michigan Department of Natural Resources.
Identification/Description; Photographs; Introduction History; Impacts; Distribution; Dispersion

The Effect of the Hemlock Woolly Adelgid, Adelges tsugae in New Jersey Hemlock Stands: Annual Report (2009; PDF | 355 KB)
New Jersey Department of Agriculture.
Photographs; Impacts; Distribution

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

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University/Academic

Hemlock Woolly Adelgid (PDF | 369 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
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

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International

Adelges tsugae - Invasive Species Compendium
Centre for Agricultural Bioscience International (CABI).
Taxonomy; Identification/Description; Impacts; Life Cycle; Habitat; 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

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Organizations

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

Hemlock Woolly Adelgid
Don'tMoveFirewood.org.
Photographs; Introduction History; Impacts; Distribution; Controls

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

Citations

Havill, N.P., M.E. Montgomery, G. Yu, S. Shiyake, and A. Caccone. 2006. Mitochondrial DNA from hemlock woolly adelgid (Hemiptera: Adelgidae) suggests cryptic speciation and pinpoints the source of the introduction to eastern North America. Annals of the Entomological Society of America 99(2):195-203.

Orwig, D.A., D.R. Foster, and D.L. Mausel. 2003. Landscape patterns of hemlock decline in New England due to the introduced hemlock woolly adelgid. Journal of Biogeography 29(10-11):1475-1487.

Wallace, M.S., and F.P. Hain. 2000. Field surveys and evaluation of native and established predators of the hemlock woolly adelgid (Homoptera: Adelgidae) in the southeastern United States. Environmental Entomology 29(3):638-644.

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Last Modified: Jul 19, 2014
 
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