What kind of lichen? Are they cutting out light/air movement or????
Enough lichens on the bark causes the bark to deteriorate and introduces bacterial diseases and harmful fungus. I lost a whole grove of cherry trees due to allowing the lichens to grow too thickly on them. Pity too, really good Montmorency trees that produced heavily.
Now I make the bark a hostile environent for lichens and fungus by treating the bark with a weak copper solution.
James
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