Walnut Twig Beetle

Thousand Cankers Disease - Black Walnut

 

Scale Insect -- Fungal fruiting bodies

Beech Bark Disease

 

Emerald Ash Borer

 

Asian long-horned beetle

 
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Below are links to either the United States or the State of Maryland Department of Agriculture pages for these serious invasive forest pests:

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Invasive plant species are a concern also. Please visit Plant Invaders of Mid-Atlantic Natural Areas,  a on-line resource of the Natural Park Service and U.S. Fish and Wildlife Service. To report a suspected invasive species and other information about emerging invasive plant pests, see Maryland Department of Agriculture Emerging Invasive Plant Pests

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Hemlock Wooly Adelgid