Non-Chemical Management
- Plant resistant species and varieties (E. japonica 'Patens' is very susceptible; variegated cultivars are seldom infected).
- Plant in full sun.
- Do not overfertilize. Powdery mildew prefers succulent new growth.
- Space plants and prune to provide good air circulation.
- Watch for signs of infection during appropriate weather.
- Pick off and destroy (do not compost) infected leaves.
- Collect and destroy leaf debris from under plants.
- Spray upper and lower leaf surfaces with a strong stream of water. Spray only when leaves can dry quickly.
Select non-chemical management options as your first choice!