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    Latest Information on Invasive Species in Michigan


      Why we care: 
      Why we care:

    This large, showy beetle was accidentally introduced into the U.S. on several occasions, probably in wood crating or pallets shipped from Asia.  Larvae feed in tunnels (called galleries) in the wood of tree branches and trunks.  The galleries can cause branches or trees to break and will eventually kill the tree.  North American trees have little or no resistance to infestation.  Click here to read more about the Asian Longhorned Beetle. 

      These tiny insects secrete white wax as they feed on sap from hemlock shoots and branches.  Hemlock Woolly Adelgid (HWA) feeding can kill needles, shoots and branches.  Over time, growth slows as trees become less vigorous and trees may take on a grayish-green appearance.  Infested hemlocks, especially large, old trees, are often killed when other stress factors, such as drought, affect trees. Click here to read more about Hemlock Woolly Adelgid.  Click for the Hemlock Woolly Adelgid Quarantine.

     Asian Longhorned Beetle
    Asian Longhorned BeetleJoe Boggs,
    Ohio State University Extension



    Hemlock Woolly Adelgid
    Hemlock Woolly Adelgid
    Elizabeth Willhite, USDA Forest Service,

                         Why we care:


                 BALSAM WOOLLY ADELGID - 
                            Why we care:

    Thousand Cankers Disease (TCD) involves an insect native to the southwestern U.S. and a newly identified pathogen.  It is a relatively new concern for black walnut trees.  When tiny walnut twig beetles feed on tree branches, they introduce a fungal pathogen that causes TCD in live trees.  The pathogen kills small areas of tissue, resulting in cankers.  As more cankers form, branches die and over time, the entire tree succumbs.  Click here to read more about Thousand Cankers Disease.   

     Balsam woolly adelgid (BWA) is a sap-feeding insect that attacks true fir trees, including balsam fir and Fraser fir.  Repeated attacks weaken trees, cause twig gouting, kill branches and, over the course of several years, cause trees to die.  Click here to read more about Balsam Woolly Adelgid.

          Thousand Cankers Disease
    Thousand Cankers Disease

              Whitney Cranshaw, Col. State University

              Balsam Woolly Adelgid
    Balsam Woolly Adelgid image
    William M. Ciesla,
    Forest Health Management International,

                        OAK WILT -
                     Why we care:


                    BEECH BARK DISEASE -
                         Why we care:

    Oak wilt kills healthy red oaks. White oaks can also be affected but are more resistant and less vulnerable to mortality from the disease. Once a red oak becomes infected with the oak wilt fungus, the tree will die, and there is no treatment to save the infected tree. Once an oak wilt infection is confirmed, however, treatments are available to save surrounding oaks and stop the spread of this disease.  Click here to read more about Oak Wilt.    

    Beech bark disease (BBD) is caused by both asap-feeding scale insect and a fungus.  American beech trees are first infested with beech scale. Scale feeding allows infection by the Neonectria fungus. The fungus kills the wood, blocking the flow of sap. Affected trees decline in health and eventually die. Some infected trees break off in heavy winds before dying – a condition called "beech snap" (see photo).  The scales are covered with white wool, turning infested portions of the tree white.  Click here to read more about Beech Bark Disease.

    Oak WiltOak Wilt image Bill Radtke, Michigan DNR Forest  Health Program


                     Beech Bark Disease
    Beech Bark Disease image
     Michigan DNR Forest Health Program photo archive




    New Video from Michigan State University Explains How to Identify This Plant




    Click Here for MDARD's Overview of Giant Hogweed 



    Examples of Giant Hogweed 








    Related Documents
    Asian Longhorned Beetle Forest Pest Alert - 470136 bytes PDF icon
    Balsam Woolly Adelgid Forest Pest Alert - 320594 bytes PDF icon
    Beech Bark Disease Forest Pest Alert - 833602 bytes PDF icon
    Hemlock Woolly Adelgid Forest Pest Alert - 606593 bytes PDF icon
    Oak Wilt Forest Pest Alert - 233634 bytes PDF icon
    Thousand Cankers Disease Forest Pest Alert - 494758 bytes PDF icon

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