Identify, Prevent, And Treat Box Blight

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Box blight how to identify, prevent, and treat this common disease

Identify, Prevent, and Treat Box Blight

What is Box Blight?

Box blight is a fungal disease that affects boxwood plants (Buxus spp.). It is caused by the pathogen Cylindrocladium buxicola or Pseudonectria buxi, and it can cause severe damage to boxwood hedges, topiaries, and other ornamental boxwood plants.

How to Identify Box Blight?

Box blight can be identified by several symptoms. Look for dark brown or black leaf spots, often with yellow halos, on the leaves. Infected leaves may also turn yellow or brown and fall off. In severe cases, the stems and branches can develop dark lesions, which can lead to dieback of the plant. Fungal spores may also be visible as white, fluffy masses on the undersides of leaves or on affected branches.

How to Prevent Box Blight?

Preventing box blight starts with choosing healthy plants from reputable sources. Avoid planting boxwoods in areas with poor air circulation and excessive moisture, as these conditions promote the growth of the fungus. Pruning boxwoods to improve airflow and sunlight penetration can also help prevent box blight. Additionally, regularly disinfecting pruning tools and removing diseased plant material can reduce the spread of the disease.

How to Treat Box Blight?

If you suspect your boxwood plants have box blight, it’s important to act quickly to prevent further spread. Prune infected branches, making sure to disinfect pruning tools between cuts. Remove fallen leaves and debris from the area to reduce fungal spores. Fungicides may also be used, but it’s important to follow the instructions carefully and use them in conjunction with other measures as part of an integrated pest management approach.

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Can Box Blight Be Cured?

While box blight cannot be completely cured, early detection and proper management can help control the disease and minimize its impact. Regular monitoring of boxwood plants, prompt removal of infected plant material, and implementing preventive measures can greatly reduce the risk of severe damage. It’s important to remember that prevention and early intervention are key in managing box blight.


Box blight can be a devastating disease for boxwood plants, but with proper identification, prevention, and treatment, its impact can be minimized. By choosing healthy plants, improving airflow and sunlight penetration, regularly disinfecting tools, and promptly removing infected material, gardeners can protect their boxwood plants from box blight and ensure their long-term health and beauty.


1. University of California Agriculture and Natural Resources –

2. Royal Horticultural Society –