Oil Discoloration of Foliage
Abiotic Abiotic disorder
Last updated
Quick Reference
Category
Abiotic
Symptoms
Foliage develops visible discoloration and residue from oil-based sprays applied to the plant or drifting from nearby applications. Symptoms are most pronounced on blue-needle spruce cultivars, particularly on needles with blue glaucous coatings.
Diagnostic Features
Visual presence of oil residue on foliage; history of spray oil application; restricted to plants exposed to oil products.
Triggers & Conditions
Vulnerability Window
Year-round, any season when sprays are applied.
Data Maturity Baseline Extension data. Expert review underway.