1|Page
ISA ARBORIST CERTIFICATION TEST STUDY
GUIDE QUESTIONS & VERIFIED ANSWERS
WITH RATIONALES 2025/2026
When cabling a multi stemmed tree, extra support can be added by:-correct-
answer-Cabling the limbs together in triangular combinations.
A condition with a cluster of dwarfed shoots on affected twigs:-correct-answer-
Witch's broom
Twig dieback from periodical cicadas is primarily a result of:-correct-answer-
Ovipositing, egg-laying
Plant damage associated with a sap-feeding insect pest might appear as:-correct-
answer-Distorted leaves or shoots.
Scale damage to plants is the result of:-correct-answer-Phloem-feeding insects
causing a loss of vigor
, 2|Page
Damage caused by non-living factors tend to be:-correct-answer-Uniform with
definite borders
Plant Health Care is a comprehensive program to manage:-correct-answer-The
appearance, health, structure of plants.
Mortality spiral describes the:-correct-answer-Cumulative effects of stress causing
decline of a plant over time.
Process of gathering information, assessing problems, determine client
expectations, and coarse of action is:-correct-answer-Appropriate response
process
Systematic pesticide is one that:-correct-answer-Is translocated throughout the
plant.
Releasing predators or parasites of an insect pest is an example of a:-correct-
answer-Biological control
ISA ARBORIST CERTIFICATION TEST STUDY
GUIDE QUESTIONS & VERIFIED ANSWERS
WITH RATIONALES 2025/2026
When cabling a multi stemmed tree, extra support can be added by:-correct-
answer-Cabling the limbs together in triangular combinations.
A condition with a cluster of dwarfed shoots on affected twigs:-correct-answer-
Witch's broom
Twig dieback from periodical cicadas is primarily a result of:-correct-answer-
Ovipositing, egg-laying
Plant damage associated with a sap-feeding insect pest might appear as:-correct-
answer-Distorted leaves or shoots.
Scale damage to plants is the result of:-correct-answer-Phloem-feeding insects
causing a loss of vigor
, 2|Page
Damage caused by non-living factors tend to be:-correct-answer-Uniform with
definite borders
Plant Health Care is a comprehensive program to manage:-correct-answer-The
appearance, health, structure of plants.
Mortality spiral describes the:-correct-answer-Cumulative effects of stress causing
decline of a plant over time.
Process of gathering information, assessing problems, determine client
expectations, and coarse of action is:-correct-answer-Appropriate response
process
Systematic pesticide is one that:-correct-answer-Is translocated throughout the
plant.
Releasing predators or parasites of an insect pest is an example of a:-correct-
answer-Biological control
