Invasive Diseases

Look closely on the underside of impatiens leaves for the mold spores.

A new disease is affecting all types of beech trees in the northeastern United States. Symptoms of Beech Leaf Disease include dark bands on leaves, yellowing and distorted leaves. Maryland residents should report symptoms to Extension.

Although not yet identified in Maryland, be on the lookout for sudden oak death.

Oak trees declining with no obvious external causes may have the invasive oak wilt disease.

Thousand cankers disease has been identified in Maryland.

Boxwood blight is a devastating disease of boxwood plants.

Invasive and deadly beech bark disease.