Non-Chemical Management
- Plant disease-resistant cultivars. Limited information indicates that 'Karen's Appalachian Blush' and 'Jean's Appalachian Snow' are disease-resistant, 'Cherokee Brave' and 'Sterling Silver' are moderately resistant, and many cultivars of Cornus kousa are tolerant. Many red-flowered cultivars of Cornus florida are susceptible.
- Improve air circulation to reduce relative humidity and accelerate drying of foliage.
- Space plants well and plant in more exposed areas. Avoid planting in heavily shaded areas.
- Irrigate with microjet sprinklers or soaker hoses to avoid wetting foliage.
- Prune out and destroy infected tissue as it appears early in the year. It can be damaging to remove too many leaves.
- In the fall, rake up and destroy fallen leaves.
Select non-chemical management options as your first choice!