Extension > Garden > Diagnose a problem > What's wrong with my plant? > Evergreen Trees and Shrubs > Arborvitae > Powdery black coating on foliage
Arborvitae > Foliage > Powdery black coating on foliage
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Sooty mold
- Black, brown or gray powdery patches or coating on foliage and twigs
- Forms on honeydew (sticky, shiny secretions) produced by aphids or scale insects
- Can spread to other plants or plant parts not attacked by these insects
- More information on Sooty mold
