One-Sided Arborvitae Browning: Mite Infestation Likely

Diagnosing Asymmetric Damage

A Cape Cod planting of 35 arborvitae shows gold/brown discoloration on neighbor's side only; owner's side remains green.

Mite Infestation Suspected

Ed Gulliksen asks if owner's side is treated. Untreated neighbor's side likely hosts spruce spider mites. Recommends:

• Spray both sides next spring – Miticide in late spring
• Fertilize fall and spring – Recovery from damage

Asymmetric damage often indicates localized pest pressure.