By Teo Spengler Heart rot refers to a type of fungus that attacks mature trees and causes rot in the center of tree trunks and branches. The fungus damages, then destroys, a tree’s structural components and, in time, makes it a safety hazard. The damage can initially be invisible from the outside of the tree, but you can detect diseased trees by the fruiting bodies on the outside of the bark. What is Heart Rot Disease? All hardwood trees are susceptible to varieties of fungal infections known as heart rot tree disease. The fungi, especially Polyporus and Fomes spp., cause the “heartwood” at the center of these trees’ trunks or branches to decay. What Causes Heart Rot? The fungi causing heart rot in trees can attack almost any tree, but old, weak and stressed trees are most susceptible. The fungi destroys the tree’s cellulose and hemicellulose and sometimes its lignin,
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