ISA BCMA Practice Questions - ISA Board Certified Master Arborist (BCMA) Exam

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A street tree planted in a 1.2 m (4 ft) wide tree pit surrounded by pavement shows progressive crown dieback over several years with no pathogen present. The MOST probable abiotic stressor is:

Excessive available phosphorus limiting root elongation Restricted rooting volume and compaction limiting water and oxygen Excessive organic mulch depth suffocating the root flare Overhead wire clearance conflicts limiting crown development

Correct Answer:

Restricted rooting volume and compaction limiting water and oxygen

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