Kinnikinnick: Leaf spot
Photo by: R.S. Byther
Biology
Leaf spot is a fungal disease. symptoms include development of brown, necrotic spots on leaves.
The fungus most likely overwinters on infection leaves and possibly on twigs.
The disease is favored by cool, wet conditions and is spread by splashing water.
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!
- Rake and destroy fallen leaves.
- Remove and destroy infected leaves from plants, where practical.
- Avoid overhead irrigation.
- Space plantings and prune to improve air circulation. Avoid planting in moist, shady areas if leaf spot is a problem.
- The variety ‘Massachusetts’ is reported to be resistant to leaf spot.
Chemical Management
IMPORTANT: Always read and follow label directions when working with pesticides.
- For more information on using pesticides visit Home and Garden Fact Sheets | Pesticide Resources and Education Program | WSU.
- Also visit Pacific Northwest Pest Management Handbooks.
- None recommended
WSU Extension programs and employment are available to all without discrimination.
Evidence of noncompliance may be reported through your local Extension office.