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Boxwood Blight

Boxwood blight

4 host plants

Last updated

Data Coverage 3 of 6 dimensions
Causal Agent
Host Plants
Symptoms
Management
GDD Threshold
Regional Notes

Boxwood blight causes leaf spots with dark centers and yellow halos on boxwood foliage. You'll notice rapid defoliation and stem cankers that girdle branches. The disease spreads via water splash and contaminated pruning tools. Remove infected plants immediately, disinfect all tools, and improve air circulation around plantings.

To limit spread and movement of the pathogen, all confirmed infected plants should be destroyed. Isolate and contain new shipments of boxwood for at least a 30-day observation period.

Quick Reference

Causal Agent
Boxwood blight
Host Plants
4

Management

Cultural Controls

  • To limit spread and movement of the pathogen, all confirmed infected plants should be destroyed.
  • Isolate and contain new shipments of boxwood for at least a 30-day observation period.
  • Locate the isolation area well away from existing blocks or outgoing shipments, and scout weekly.
  • Break up large blocks of Buxus with non-host species to limit exposure and potential losses due to this disease.
  • Do not reuse or recycle or compost infected plants, media, or containers.
  • Professional composting is fine.

Host Plants (4)