Emerald Green Arborvitae Browning: Juniper Blight Likely

Wes's 3-year-old arborvitae hedge (15 plants in groups of 3) has two groups turning brown. He asks about mortality rates and 3-year die-off.

Key Requirements

• Zones 6–9, full sun, good drainage.
• Long-lived—often outlive houses.

Probable Cause: Juniper Blight

Browning branches suggest Phomopsis or Kabatina blight.

Action Plan

1. Prune dead branches when foliage is dry; disinfect pruners (1:9 bleach:water).
2. Remove debris completely.
3. Spray with fungicide containing copper, potassium bicarbonate, or propiconazole—repeat several times.

Success is likely with consistent treatment.