Another method to kill tree lichen is to spray the tree with copper-sulfate. Copper-sulfate sprayed on lichens on trees will kill the fungus side of the organism. Only use copper-sulfate as a treatment for tree lichen in late spring through early fall.

Does vinegar kill lichen?

You can remove moss and lichens from your roof by using vinegar as an environmentally friendly weed killer. Roof cleaning is an important aspect of having your house look new and not aged.

How do you get rid of lichens?

If you absolutely must remove lichen, spray your branches with a gentle soapy solution. After wetting the lichen, you can use a natural-bristle scrub brush and gently exfoliate the lichen off. Don't scrub hard, especially on young, thin bark. You can wash off the residue with a stream of water from your garden hose.