Shrub Diseases

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Updated: January 19, 2022

IPM - Prevent, Identify, and Manage Plant Problems

How to ID, prevent, and manage plant problems in Maryland using IPM
no lawn landscape
Updated: January 13, 2022

Hydrangea: Identify and Manage Problems

Hydrangeas (Hydrangea spp.) are popular flowering shrubs in Maryland summer gardens.
blue hydrangea blossoms
Updated: January 10, 2022

Azaleas and Rhododendrons: Identify and Manage Problems

List of azalea and rhododendron diseases, insect pests, and abiotic problems.
rhododendron bloom
Updated: January 10, 2022

Boxwood: Identify and Manage Common Problems

Diagnose, manage, and prevent common boxwood problems
Updated: November 30, 2021

Lilacs: Identify and Manage Problems

There are several species of lilacs that are grown in Maryland.
lilac bloom
Updated: October 26, 2021

Roses: Identify and Manage Problems

List and descriptions of common rose problems
pink rose blossom
Updated: October 25, 2021

Fungal Leaf Spots on Shrubs

Cool wet spring weather favors fungal leaf spot diseases on evergreen and deciduous shrubs.
cercospora leaf spot on hydrangea
Updated: September 29, 2021

Phytopthora Root Rot on Shrubs

Foliage on rhododendron and related shrubs appear wilted and leaves roll inward.
phytophthora root and crown root symptoms on rhododendron
Updated: September 29, 2021

Botryosphaeria Canker of Shrubs

Scattered dying branches on rhododendron could be the common fungal botryosphaeria canker.
botryosphaeria canker on rhododendron
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.