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

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Marginal leaf scorch with a sharp boundary between green and brown tissue, appearing first on the windward and upper crown during a hot dry spell, most strongly indicates:

Bacterial leaf scorch with progressive branch-by-branch decline Abiotic drought and high evaporative demand on exposed crown Nitrogen toxicity from recent high-rate fertilizer application Root rot fungi blocking xylem throughout the crown

Correct Answer:

Abiotic drought and high evaporative demand on exposed crown

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