ISA Certified Arborist Practice Exam

The indication of yellowing leaves and stunted growth is associated with root rot in a tree. When roots are compromised due to rot, they are unable to efficiently absorb water and nutrients, leading to poor overall health. This nutrient deficiency often manifests as yellowing leaves, a condition known as chlorosis, which occurs when leaves fail to produce enough chlorophyll. Additionally, the stunted growth reflects a tree's inability to thrive, as it cannot support its usual development due to the compromised root system.

In contrast, brown leaves and rapid growth, healthy foliage and strong branches, and a full bloom of flowers do not correlate with root rot. Brown leaves typically suggest water stress, while rapid growth may indicate a tree is healthy or well-nourished; healthy foliage and strong branches would signify a robust tree, and a full bloom of flowers can indicate reproductive health, neither of which aligns with the symptoms of root rot.