ISA Certified Arborist Chapter 10 (Diagnosis and Plant Disorders) Exam Questions and Answers

ISA Certified Arborist Chapter 10
(Diagnosis and Plant Disorders)



True/False - Information about a tree's history and symptoms gained from a home
owner can always be considered accurate. CORRECT ANSWERS False

If a tree is not well suited for the site in which it has been planted, it may become
_______, predisposing it to other problems. CORRECT ANSWERS stressed

A common mistake in diagnosis is to carefully examine the aboveground portion of the
tree, while ignoring the _______. CORRECT ANSWERS roots

True/False - Vascular diseases of trees are rarely fatal. CORRECT ANSWERS False

True/False - Diseases that affect only the foliage of a tree may not be a serious problem
unless defoliation occurs in several consecutive years. CORRECT ANSWERS True

True/False - Most fungi cause plant disease. CORRECT ANSWERS False

True/False - The pathogens that cause plant diseases are primarily fungi. CORRECT
ANSWERS True

Fire blight is an example of a disease caused by a _______. CORRECT ANSWERS
bacterium

True/False - If a tree declines or dies within the first year following installation, a likely
cause is excess or insufficient water. CORRECT ANSWERS True

Leaf scorch, girdling roots, and mineral deficiencies are examples of _______ disorders.
CORRECT ANSWERS abiotic

Name five causes of physical or mechanical injuries to trees. CORRECT ANSWERS
lawn mower/string trimmer

vandalism

construction

rodents