What symptom does Heterobasidion annosum root disease display at the base of affected trees?

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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 symptom does Heterobasidion annosum root disease display at the base of affected trees?

Explanation:
Heterobasidion annosum root disease primarily affects the roots and lower trunk, so the symptom you’d expect at the base of an affected tree is butt decay. The fungus moves from the roots into the bottom portion of the trunk, decaying the wood there. That creates soft, discolored, and often hollowed wood right at the butt end, which weakens the tree and increases the risk of windthrow. The other options describe symptoms that are more about the canopy or trunk bark and aren’t the typical base manifestation of this root disease. So the clear base sign is butt decay.

Heterobasidion annosum root disease primarily affects the roots and lower trunk, so the symptom you’d expect at the base of an affected tree is butt decay. The fungus moves from the roots into the bottom portion of the trunk, decaying the wood there. That creates soft, discolored, and often hollowed wood right at the butt end, which weakens the tree and increases the risk of windthrow. The other options describe symptoms that are more about the canopy or trunk bark and aren’t the typical base manifestation of this root disease. So the clear base sign is butt decay.

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