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Box Blight in Boxwood

How to identify and treat box blight in Boxwood.

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Boxwood care requirements

water
Regularly when establishing. Moderate once established.
soil
Well-draining, fertile soil.
light
Full sun to partial shade.
symptoms

Symptoms to look for in Boxwood

  • fiber_manual_recordBrown, circular leaf spots with dark edges
  • fiber_manual_recordBlack streaking on stems
  • fiber_manual_recordRapid, patchy leaf drop leaving bare sections in the plant
help

Common causes in Boxwood

Caused by the fungi Calonectria pseudonaviculata or Calonectria henricotiae, which thrive in warm, humid, still air and spread via water splash, tools, and contaminated plant material.

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How to treat box blight in Boxwood

Prune out and destroy infected branches, clear fallen leaves from around the plant, and apply a labeled fungicide as part of an ongoing management program.

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Preventing box blight in Boxwood

Improve airflow by thinning dense growth, avoid overhead watering, disinfect tools between plants, and consider resistant boxwood cultivars or alternatives in high-risk areas.