Shrub Diseases

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Updated: September 16, 2021

IPM - Prevent, Identify, and Manage Plant Problems

How to ID, prevent, and manage plant problems in Maryland using IPM
no lawn landscape
Updated: September 20, 2021

Hydrangea: Identify and Manage Problems

Hydrangeas (Hydrangea spp.) are popular flowering shrubs in Maryland summer gardens.
blue hydrangea blossoms
Updated: September 8, 2021

Azaleas and Rhododendrons: Identify and Manage Problems

List of azalea and rhododendron diseases, insect pests, and abiotic problems.
rhododendron bloom
Updated: September 3, 2021

Diagnostic Chart of Azalea and Rhododendron Problems

A simple chart of symptoms and possible causes
Updated: August 25, 2021

Petal Blight on Shrubs - Ovulina

Ovulina petal blight begins as water soaked spots on petals and can cause flowers to completely collapse.
Updated: August 25, 2021

Boxwood: Growing and Diagnosing Common Problems

Diagnose, manage, and prevent common boxwood problems
Updated: May 24, 2021

Common Problems of Roses

List and descriptions of common rose problems
pink rose blossom
Updated: April 29, 2021

Boxwood Blight

Boxwood blight is a devastating disease of boxwood plants.
boxwood defoliation from boxwood blight
Updated: April 21, 2021

Exobasidium Gall on Azalea

Puffy white growths on newly expanded leaves of azaleas are common during cool wet spring weather.
Updated: April 21, 2021

Volutella Blight Disease of Boxwood

Tips of boxwood branches turn yellow to tan. Loose bark on affected branches may indicate this fungal disease.
boxwood  pseudonectria canker symptoms