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Porodaedalea pini, commonly known as the pine conk, [1] is a species of fungus in the family Hymenochaetaceae. It is a plant pathogen that causes tree disease commonly known as "red ring rot" or "white speck". This disease, extremely common in the conifers of North America, decays tree trunks, rendering them useless for lumber. [2]
The stump (and tap root) that is left in the ground after a tree has fallen or has been cut is the primary source of fatwood, as the resin-impregnated heartwood becomes hard and rot-resistant after the tree has died. Wood from other locations can also be used, such as the joints where limbs intersect the trunk.
Tree stump, about 37 years after falling. After a tree has been cut and has fallen, the stump or tree stump is usually a small remaining portion of the trunk with the roots still in the ground. Stumps may show the age-defining rings of a tree. The study of these rings is known as dendrochronology. Stump sculpture by German artist Eberhard Bosslet
Trees will eventually die. A landscape scale symptom is the rings of dead trees in various stages of decay and death, with the oldest at the center and progressively younger moving outward. The white rot fungus found in the roots is the sign of telling whether the tree has been affected by H. annosum.
The trees die from failure to take up water and nutrients because the main roots are decayed. The death is also accelerated by wind that throws the trees down. It is estimated that Laminated root rot reduces timber production by about 4.4 million cubic meters annually. [4] Wood losses in British Columbia are estimated to be 1.4 million cubic ...
A single tree planted in a suburb of San Diego in the 1940s or 1950s has grown tall and straight, and to a large size, 108 feet (33 m). [28] Shipley Nature Center states it can grow to 148 ft (45 m) in height in cultivation. [29] [30] It is sold by at least ten different plant nurseries in California as of 2020. [25]
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