USDA. FS. Southern Research Station. CompassLive.
Laricobius nigrinus is a small beetle that eats an even smaller bug – the hemlock woolly adelgid, or HWA. Since 2003, Laricobius has been used to help control HWA. But the beetle, which is native to western North America, is only active during the fall, winter and early spring. Recently, USDA Forest Service research entomologist Bud Mayfield and his colleagues, including students and prominent researchers, published the results of a six-year collaboration on Laricobius as biocontrol.
Silvicultural recommendations for managing HWA are still in development. But when they are available, Mayfield and his colleagues plan to update their resource manager’s guide. They wrote the guide for managers who want to use an integrated pest management strategy to control hemlock woolly adelgids.
Distribution / Maps / Survey Status
USDA. FS. Northern Research Station.
Select the non-indigenous forest pest to view maps depicting state and county distribution. Produced by: USDA, FS, Forest Health Protection, and its partners.
University of Georgia. Center for Invasive Species and Ecosystem Health.Provides state, county, point and GIS data. Maps can be downloaded and shared.
USDA. FS. Northeastern Area State and Private Forestry.Provides distribution maps and predicted future range expansion.
USDA. APHIS. Cooperative Agricultural Pest Survey. National Agricultural Pest Information System.
Vermont Department of Forests, Parks and Recreation. Forestry Division.
Google. YouTube; TheHemlockWoollyAdelgid.com
Google. YouTube; New York Department of Environmental Conservation.
The section below contains highly relevant resources for this species, organized by source. Or, to display all related content view all resources for Hemlock Woolly Adelgid.
USDA. Forest Service; Southern Regional Extension Forestry. Forest Health Program.
See also: Hemlock Woolly Adelgid for more resources
National Plant Diagnostic Network.
New York Invasive Species Clearinghouse.
State and Local Government
Wisconsin Department of Natural Resources.
Pennsylvania Department of Conservation and Natural Resources.
Maine Department of Conservation. Maine Forest Service. Forest Health and Monitoring Division.
Ohio Department of Agriculture. Plant Health.
Tennessee Department of Agriculture.
Rutgers University. New Jersey Agricultural Experiment Station.
Cornell University. Forest Health and Invasive Non-native Forest Pests.
- Annand, N.P. 1928. A contribution toward a monograph of the Adelginae (Phylloxeridae) of North America. Stanford, Calif.: Stanford University Press.
- 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. Proceedings: Symposium on Sustainable Management of Hemlock Ecosystems in Eastern North America. GTR-NE-267: 104-109.