Lichens on Maple Tree: Harmless, Not Cause of Skin Irritation or Tree Death

Lichens on Maple Tree: Harmless, Not Cause of Skin Irritation or Tree Death

Bright green, fuzzy, tight-knit growth on a declining silver maple is likely lichens (symbiotic fungi/algae), not moss. Lichens do not kill trees; they indicate slow growth from age or drought stress. The severe skin reaction after climbing is unlikely from lichens—possibly mites, caterpillar hairs, or other irritants in the canopy.

Tree Care

• Lichens need no treatment; they are benign.
• Fertilize tree with slow-release fertilizer.
• Water deeply during dry periods.
• Prune dead branches.

Skin Irritation

• Consult a physician for persistent blistering/swelling.
• Wear long sleeves, gloves, and eye protection when climbing.
• Shower immediately after tree work.

Key Point

The tree's decline is from age/stress, not lichens. Dog urine at base may locally inhibit lichen growth but doesn't affect overall health.