What is the effect of Heterobasidion annosum root disease on tree stability?

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Prepare for the Oregon Forestry Pesticide Applicator Exam with flashcards and multiple choice questions. Each question includes hints and explanations to help you succeed. Get ready for your test!

Multiple Choice

What is the effect of Heterobasidion annosum root disease on tree stability?

Explanation:
The disease weakens the tree at the base. Heterobasidion annosum causes butt rot and decay in the lower trunk, which undermines the anchorage and connection of the tree to the soil. With the base weakened, wind forces or soil movement can more easily cause the tree to fail or topple, speeding up blowdown. It doesn’t increase leaf production, nor does it simply reduce photosynthesis or improve trunk rigidity—the core effect on stability is the loss of strong, decayed butt wood that holds the tree upright.

The disease weakens the tree at the base. Heterobasidion annosum causes butt rot and decay in the lower trunk, which undermines the anchorage and connection of the tree to the soil. With the base weakened, wind forces or soil movement can more easily cause the tree to fail or topple, speeding up blowdown. It doesn’t increase leaf production, nor does it simply reduce photosynthesis or improve trunk rigidity—the core effect on stability is the loss of strong, decayed butt wood that holds the tree upright.

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