Certified Arborist Practice Test

Question: 1 / 400

Which wall inhibits the inward spread of decay in trees?

Buckeye, Horsechestnut

The correct choice involves trees that have the ability to form a specific type of wall called a "reaction zone," which is effective in inhibiting the spread of decay. Buckeye and Horsechestnut trees exhibit these characteristics as they produce dense, chemically fortified tissues in response to injury or decay. These tissues can limit the advancement of fungi and other pathogens, thereby protecting healthier parts of the tree from the detrimental effects of decay.

This reaction is an essential defense mechanism that enables these trees to compartmentalize and manage damage, enhancing their survival despite having sustained injuries. Compartmentalization is crucial in tree health, as it allows for localized defense against threats like rot and decay, thus promoting longevity and overall vigor.

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Red Maple, Silver Birch

Oak, Pine

Cedar, Fir

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