Arborvitae Black Flagging: Abiotic Stress, Not Disease

Blackening of lower, east-facing arborvitae tips was diagnosed by UGA lab as abiotic disorder—likely heat/drought stress from the previous summer or shading of lower foliage. Newly planted trees (under 2 years) aren't fully established. Water deeply but infrequently during dry periods; avoid sprinkler irrigation on foliage.

Arborvitae – Black Flagging