When you see mushrooms or other fungi growing out of the trunk of a tree, pay attention. It’s a sign that the wood inside the tree is decaying.
“It’s something you want to have a professional look at promptly,” said Sharon Yiesla, plant knowledge specialist in the Plant Clinic at The Morton Arboretum in Lisle. ”A certified arborist has the training to assess whether the wood rot has affected the structure of the tree.”Many kinds of fungi can cause wood rot. Some are readily visible as shelf or bracket fungi — roughly semicircular projections that stick out horizontally, like a shelf.
Shelf lichens growing on a tree’s bark indicate that wood is decaying in the interior of the trunk. A professional arborist should assess the condition of the tree. “If only one branch is rotting, we can just remove the branch,” Yiesla said. “If the decay has compromised the main trunk, the whole tree may need to come down.”
A decaying tree may look fine, with plenty of healthy green leaves. “The decay fungi don’t affect the tissue just under the bark that conducts water and nutrients, so the tree can still grow,” Yiesla said.
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