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Adding more than 6 inches of soil over the root zone suffocates roots by cutting off oxygen supply, leading to decline. ISA exam questions often test recognition of grade change impacts on trees, a common cause of post-construction decline.

Verticillium wilt causes vascular streaking and scattered dieback. Exit holes indicate insects, fungal mats indicate Armillaria, and powdery coatings suggest mildew. ISA exams stress wilt recognition due to its importance in maples.

Physical trunk barriers such as boards or protective wraps prevent direct impact injuries. Fertilizer and watering do not prevent trunk wounds, and mulch should not touch bark. ISA exams emphasize trunk protection measures.

Soil compaction severely impairs roots, reducing anchorage and water uptake. Bark damage or branch pruning affects aesthetics and health but not anchorage stability to the same degree. ISA emphasizes compaction as a primary risk factor in construction zones.

Fraxinus (ash) trees produce samaras and have opposite branching. Oaks make acorns, elms produce disk samaras but with alternate branching, and birches produce nutlets. ISA exams emphasize reproductive traits for ID.