The web Browser you are currently using is unsupported, and some features of this site may not work as intended. Please update to a modern browser such as Chrome, Firefox or Edge to experience all features Michigan.gov has to offer.
Invasive Species: Balsam Woolly Adelgid
Balsam Woolly Adelgid
*Detected in Michigan*
WHAT TO LOOK FOR
- Tiny one-to-two-millimeter white woolly tufts on the lower trunk of the tree and possibly on large branches in the spring and summer.
- Swelling and distortion of the twigs, commonly called "gout".
- Flagging - a branch or branches that turn brick-red.
- Tree crowns that become narrow and misshapen with few needles.
Tiny white, cottony tufts on the trunk of an infested tree. Photo courtesy of Jerald E. Dewey, USDA Forest Service, Bugwood.org.
Swollen tissue in tree twigs, called gouting, is a sign of balsam woolly adelgid infestation. Photo courtesy of David McComb, USDA Forest Service, Bugwood.org.
REPORT THIS SPECIES
If you notice white, waxy material on twigs, branches or stems, or twig gouting on fir trees, do not move them! Take photos, note the location and report it to:
- Michigan Department of Agriculture and Rural Development, MDA-Info@Michigan.gov.
- Or - use the Midwest Invasive Species Information Network (MISIN) reporting tool.
- Or - download the MISIN smartphone app and report from your phone - MISIN.MSU.edu/tools/apps/#home
- Michigan Balsam Woolly Adelgid Quarantine
- Balsam Woolly Adelgid Quarantine List of Infested Areas
- John Bock Trade Magazine Article
- Balsam Woolly Adelgid Compliance Agreement Training
- Michigan Plant Pest Quarantines
- Michigan Quarantine Summary for Licensees