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Shrub Diseases

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Updated: September 18, 2023

Boxwood: Identify and Manage Common Problems

In Maryland gardens and landscapes, boxwood leafminer, Volutella blight, and winter injury are among the most common problems people experience with their boxwood plants. Use this resource to diagnose, manage, and prevent these common problems.
boxwood
Updated: February 24, 2023

IPM - Prevent, Identify, and Manage Plant Problems

How to ID, prevent, and manage plant problems in Maryland using IPM
no lawn landscape
Updated: September 14, 2023

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
Updated: July 14, 2023

Rose: Identify and Manage Problems

List and descriptions of common rose problems
pink rose blossom
Updated: June 12, 2023

Azaleas and Rhododendrons: Identify and Manage Problems

List of azalea and rhododendron diseases, insect pests, and abiotic problems.
rhododendron bloom
Updated: May 25, 2023

Botryosphaeria Canker of Shrubs

Scattered dying branches on rhododendron could be the common fungal botryosphaeria canker.
botryosphaeria canker on rhododendron
Updated: March 1, 2023

Petal Blight

Botrytis is a fungal disease on flowers of shrubs, bulbs, and herbaceous perennials that can spread to the stem and cause girdling and dieback.
botrytis petal blight on rose
Updated: February 27, 2023

Lilac: Identify and Manage Problems

There are several species of lilacs that are grown in Maryland.
lilac bloom
Updated: February 22, 2023

Boxwood Blight

Boxwood blight is a devastating disease of boxwood plants.
boxwood defoliation from boxwood blight
Updated: February 22, 2023

Phytophthora Root Rot on Shrubs

Foliage on rhododendron and related shrubs appear wilted and leaves roll inward.
phytophthora root and crown root symptoms on rhododendron