How Do You Kill Lichen on Trees

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.

What spray kills lichen on trees?

Treatment on trees In late autumn and winter you can use Lime Sulphur to eradicate lichen on deciduous trees only. Do not use it on evergreens, as they will defoliate (lose their leaves) and will not recover.

Can you kill lichen?

To reiterate, lichen is completely harmless to trees, and there’s no real need to get rid of it. But some people don’t view lichen as one of “nature’s wonders,” and instead consider it a green fungus on trees. If that’s the case for you, you can use a copper-sulfate fungicide to kill lichen.