Latest Information on Invasive and Exotic Species in Michigan

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MDARD Commission Water Soldier Order - 1-21-15  
 

HEMLOCK WOOLLY ADELGID 
 Hemlock Woolly Adelgid

Elizabeth Willhite, USDA Forest Service, Bugwood.org


ASIAN LONGHORNED BEETLE
Asian Longhorned Beetle
Joe Boggs, Ohio State University Extension


BALSAM WOOLLY ADELGID
Balsam Woolly Adelgid Image

William M. Ciesla, Forest Health Management International, Bugwood.org

 


THOUSAND CANKERS DISEASE -  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.  For quarantine information, click here.

THOUSAND CANKERS DISEASE
Thousand Cankers Disease
Whitney Cranshaw, Col. State University


OAK WILT - 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.

OAK WILT
Oak Wilt image
Joseph O'Brien, USDA Forest Service, Bugwood.org


BEECH BARK DISEASE  Why we care:
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.


BEECH BARK DISEASE
Beech Bark Disease image

Joseph O'Brien, USDA Forest Service, Bugwood.org


 

Giant Hogweed

Giant Hogweed was introduced into North America in the early 1900s.  Its native Central Asia, although now it occurs throughout the United Kingdom, Australia, Europe, parts of Canada and the United States.  It is suspected to have made its way into this country as ornamental.  Its size made it somewhat of an oddity and gardeners that wanted something unique imported it.  Click here to read more about Giant Hogweed.

 Man with Giant Hogweed
Man with Giant Hogweed

USDA APHIS PPQ Archive, Bugwood.org

Giant Hogweed Flower with PenGiant Hogweed flower with pen

 USDA APHIS PPQ Archive, Bugwood.org