If trees are treated correctly, they will not become infested with lichens and moss.
For processing you will need ordinary copper sulfate. It is often used in gardening and at home. As an antiseptic, it eliminates mold, rot and fungal infections.
In gardening it is used as a pesticide and fertilizer. It actively fights against pests and diseases.
It is carried out twice a year, in autumn and spring. In autumn, the treatment is carried out after all the leaves have fallen.
It does not cause any harm to trees, and it does not wash away during rains.
Just one treatment can protect trees for a long time. You need to dissolve 250 grams of copper sulfate in 1 liter of water. Add another 9 liters of water to this mixture.
Spray the trees in dry, windless weather. In spring you will be surprised by the result.