Disease ID

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Updated: September 2, 2021

What's Wrong with my Colorado Blue Spruce Tree?

Dr. Dave Clement, University of Maryland Extension Plant Pathologist, explains two common diseases of this popular evergreen tree. 
spruce branches dying - cytospora canker symptoms
Updated: August 25, 2021

Boxwood: Growing and Diagnosing Common Problems

Diagnose, manage, and prevent common boxwood problems
Updated: June 14, 2021

Diagnose Dogwood Problems - Chart

Easy to use chart to identify problems with dogwood trees.
Updated: May 24, 2021

Seiridium and Botryosphaeria Canker of Leyland Cypress

Individual Leyland cypress branches die (flagging) is a sign of cankers or lesions from fungal diseases.
brown branch tips of leyland cypress - seiridium canker symptoms
Updated: May 24, 2021

Common Problems of Roses

List and descriptions of common rose problems
pink rose blossom
Updated: May 24, 2021

Ornamental Fruit Tree Problems

Prevent, diagnose and manage ornamental fruit tree problems
crabapple and apple blossoms