Typical heavy adelgid infestation.

Photograph by Will Blozan

Old-growth hemlock forest in Great Smoky Mountains National Park

Photograph by Will Blozan

Close up of hemlock woolly adelgid (HWA) on twig.

Photograph from www.nzforestry.co.nz

Close up of HWA on hemlock twig..

Photograph by Rusty Rhea, USDA-FS Asheville, NC

Typical die back at ends of twigs following heavy HWA infestation.

Photograph by Will Blozan

Sasajiscymnus tsugae predator beetle feeding on adelgids.

Photograph from www.nsyaes.cornell.edu

Appalachian Arborists releasing Sasajiscymnus tsugae predator beetles in Joyce Kilmer Wilderness, NC.

Photograph by Will Blozan

Spray treatment of hemlocks along road.

Photograph from Great Smoky Mountains National Park Resource Management archives.

Stem injection treatment.

Photograph by Will Blozan

Appalachian Arborists climbing hemlocks in Great Smoky Mountains National Park to collect foliar samples to test for presence of imidacloprid.

Untreated tree on left and tree treated by soil application of imidacloprid on right.

Photograph by Will Blozan

The second largest known hemlock in Great Smoky Mountains National Park

Photograph by Will Blozan

Grove of hemlocks killed by hemlock woolly adelgid.

Photograph from www.deathstar.rutgers.edu/projects/hemlock

Hemlocks killed by HWA in Linville Gorge, NC. 2004

Photograph by Will Blozan