Boxwood: Leaf spot
Photo by: R.S. Byther
Biology
Boxwood leaf spot is caused by fungi which survive in fallen, diseased leaves beneath the plant.
Leaves develop discolored spots and may turn tan or brown from the margins and tips inward.
Small, black fruiting bodies of the fungus often appear on the discolored spots or the underside of the leaves.
Leaf spot is favored by wet, humid weather and damp planting conditions.
Management Options
See "Using Integrated Pest Management (IPM) in the Landscape" for successful problem management techniques.
Non-chemical Management
Select non-chemical management options as your first choice!
- Prune and destroy infected and dead plant parts.
- Collect and destroy dead leaves under plants and in branch crotches.
- To reduce likelihood of infection, avoid overhead watering and space plants to provide good air circulation.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
For more information on using pesticides visit :
- Make fungicide applications in spring before new growth starts.
Approved Pesticides
If you choose to use a pesticide, some examples of products that are legal in Washington are listed below. Some products are labeled for just INDOOR or just OUTDOOR use, or may allow both uses. Be sure to choose a product appropriate for your situation. Always read and follow all label directions.
WSU Extension programs and employment are available to all without discrimination.
Evidence of noncompliance may be reported through your local Extension office.