Invasive Diseases

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Updated: April 29, 2021

Boxwood Blight

Boxwood blight is a devastating disease of boxwood plants.
boxwood defoliation from boxwood blight
Updated: April 13, 2021

Impatiens Downy Mildew

Look closely on the underside of impatiens leaves for the mold spores.
impatiens downy mildew
Updated: April 13, 2021

Oak Wilt Disease

Oak trees declining with no obvious external causes may have the invasive oak wilt disease.
oak wilt disease
Updated: April 13, 2021

Thousand Cankers Disease

Thousand cankers disease has been identified in Maryland.
thousand cankers disease on walnut tree
Updated: March 26, 2021

Sudden Oak Death/Ramorum blight

Although not yet identified in Maryland, be on the lookout for sudden oak death.
sudden oak death symptoms on rhododendron leaf
Updated: March 18, 2021

Beech Bark Disease

Invasive and deadly beech bark disease.
beech bark disease