Lichens Don’t Kill Your Trees cover

Lichens Don’t Kill Your Trees

By


Here’s a question Grumpy gets all the time:
“My tree is dying! It has all of these greenish-gray patches on the trunks and branches. What is this disease and how can I get rid of it?”


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Common Question

Common Question

Here’s a question Grumpy gets all the time.

“My tree is dying! It has all of these greenish-gray patches on the trunks and branches. What is this disease and how can I get rid of it?”

Image by Steve Bender

The Good and Bad

The Good and Bad

Well, I have some bad news and some good news. The bad news is your tree really is dying. The good news is those greenish-gray patches have nothing to do with it. Yay!!!!

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Joy

Joy

Happiness is knowing something’s not killing your tree.

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Say Hello to Lichens

Those patches represent a unique form of life called lichens (pronounced: lie-kens). See, you be liking them already!

A lichen consist of two different organisms engaged in a symbiotic relationship — which is different from marriage in that lichens usually last a very long time and both partners benefit.

One partner is a fungus, whose job it is to anchor the lichen to the branch or stone where it’s growing. The other is cyanobacteria (formerly known as blue-green algae), that turn sunlight into food for the lichen. They spread by either spores or tiny plant bits that travel on the wind and use branches and trunks only for support.

Common Fungus

There are hundreds of different kinds of lichens and they live everywhere on Earth except in North Korea, where there is no light.

A very common type, shown at the beginning, is called a foliose lichen. It looks like a clump of little lettuce leaves. They’re a good food source for hungry wildlife. They’re also an excellent source for antibiotic compounds used in human medicine.

Not Your Killer

Not Your Killer

However, they do NOT kill trees. So why do so many dying trees sport a thick coating of lichens? Because lichens need sunlight to grow. Dying trees with fewer leaves to shade their branches provides lots of that. Something is killing your trees, but the culprit isn’t lichens.

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Love Your Lichens

Love Your Lichens

So stop hating on lichens. In Grumpy’s enlightened opinion, they’re very cool. They’re also good for your health, because their presence is a sign of clean, healthy air, as lichens don’t like dirty, polluted air.

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