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 Botanic Garden >> Gardening >  >> Question and Answer >> Plant Diseases

Greenish-Blue Growth on Fruit Tree Trunks: Harmless Lichens

Fruit trees have greenish-blue growth on lower trunks. Owner wants removal for appearance.

Identification: Lichens

Symbiotic algae-fungus organisms. Not parasitic; no harm to trees. Indicate clean air.

If Removal Desired

  • Copper fungicide (e.g., Hi-Yield Copper Fungicide) applied per label.
  • Multiple applications needed; likely return in a year.

Best to leave them—they're beneficial indicators.

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