Information: Identification and Threats
Hemlock woolly adelgid (Adelges tsugae) is an insect that that infests eastern hemlock trees, and is originally from East Asia. It feeds by sucking sap from hemlock trees, killing needles, shoots and branches. If not treated, it can result in tree death in about 4 to 10 years. It has been detected in western Michigan in both forest and landscape settings, and was recently found in Washtenaw County! If you have hemlock trees on your property, check them for small, white, cottony masses found at the base of needles or on the underside of hemlock branches. While they are present year-round, they most visible November through July. Please read on for more information on this species, and contact us if you have any questions!
* Door-to-door informational blitz will take place on June 22nd & June 23rd (neighbourhood near University of Michigan Nichols Arboretum) by staff from DNR, JLW CISMA, MDARD, and University of Michigan
**Join us for a virtual HWA informational seminar on July 20th at 2pm. Register here: tinyurl.com/JLWHWA
* Door-to-door informational blitz will take place on June 22nd & June 23rd (neighbourhood near University of Michigan Nichols Arboretum) by staff from DNR, JLW CISMA, MDARD, and University of Michigan
**Join us for a virtual HWA informational seminar on July 20th at 2pm. Register here: tinyurl.com/JLWHWA
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Current Infestations in Michigan
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For More Information:
1. State of Michigan: Hemlock woolly adelgid community information toolkit.
https://www.michigan.gov/invasives/education/hemlock-woolly-adelgid-community-information-toolkit
2. Unites States Forestry Service: Hemlock woolly adelgid.
https://www.fs.usda.gov/detail/r8/forest-grasslandhealth/insects-diseases/?cid=stelprd3842820
3. Michigan State University Extension: How to treat hemlock trees for hemlock woolly adelgid.
https://www.canr.msu.edu/resources/how_to_treat_hemlock_trees_for_hemlock_woolly_adelgid
4. Michigan State University Extension: Options for protecting hemlock trees from hemlock woolly adelgid.
https://www.canr.msu.edu/resources/options_for_protecting_hemlock_trees_from_hemlock_woolly_adelgid_e3349
5. MISIN: Where to report invasive species in the Great Lakes region.
https://www.misin.msu.edu/report/misin/?project=misin
1. State of Michigan: Hemlock woolly adelgid community information toolkit.
https://www.michigan.gov/invasives/education/hemlock-woolly-adelgid-community-information-toolkit
2. Unites States Forestry Service: Hemlock woolly adelgid.
https://www.fs.usda.gov/detail/r8/forest-grasslandhealth/insects-diseases/?cid=stelprd3842820
3. Michigan State University Extension: How to treat hemlock trees for hemlock woolly adelgid.
https://www.canr.msu.edu/resources/how_to_treat_hemlock_trees_for_hemlock_woolly_adelgid
4. Michigan State University Extension: Options for protecting hemlock trees from hemlock woolly adelgid.
https://www.canr.msu.edu/resources/options_for_protecting_hemlock_trees_from_hemlock_woolly_adelgid_e3349
5. MISIN: Where to report invasive species in the Great Lakes region.
https://www.misin.msu.edu/report/misin/?project=misin
