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Heartwood Decay

Heartwood decay, also known as "heart rot," is a significant disease affecting merchantable hardwood timber. This fungal infection deteriorates the heartwood of trees, impacting their timber value. Although it may not kill the tree, it renders the wood unusable for products and can cause safety concerns if left unchecked. Preventative measures include minimizing pruning wounds, managing tree shape early in life, and monitoring tree health regularly. Affected species include Douglas Fir, Sitka Spruce, Western Red Cedar, and Western Hemlock.

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Heartwood Decay

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  1. Heartwood Decay By: Mackenzie Shoemaker

  2. Description: • Also known as “Heart Rot.” • Single most important and prominent tree disease for merchantable, hardwood timber. • Caused by a fungus that deteriorates the living inner wood (heartwood) of a tree.

  3. Life Cycle: • Once the decay has started, it is a naturally occurring tree process. • Will continue to grow and spread for many years. • The decay may not kill the tree, but will destroy its possibility to be used for timber products. • Depending on how severe the decay gets, the tree may be deemed “unsafe.” • As long as a tree is growing vigorously, decay will be confined to a small central core.

  4. Affected Trees: • Douglas Fir • Sitka Spruce • Western Red Cedar • Western Hemlock Douglas Fir Western Hemlock Sitka Spruce

  5. Prevention: • Avoid pruning wounds which expose large areas of wood. • Shape trees when they are young, so major branch removal won’t be necessary. • Remove broken branch stubs following any storm damage. • Keep fire and vehicles out of the woodlands. • Check trees every few years to be sure there is new growth. Western Red Cedar

  6. Works Cited • Allen, E.A., D.J. Morrison, and G.W. Wails. “Stem Decays.” DecAID <www.fs.fed.us> 1996. Web. 19 November 2012. • “Heartwood decay.” Heartwood decay. N.p. n.d. 19 November 2012. <www.extension.vmn.edu> • “Heart Rots.” Forest Health Protection, Southern Region. Forest Health Protection. 2012. 19 November 2012. <www.fs.fed.us>

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