ISA - Certified Arborist - Test
Questions #2 – PRF
What example of tree stressors can be classified as acute? PEB Pg42
- Lightning strike
- insufficient soil
- poor light exposure
- poor moisture conditions - ANS-lightning strike
What is most likely NOT a possible cause of deformed leaves? PEB pg 42
- spray injury
- air pollution
- anthracnose
- frost - ANS-Air pollution
What tree symptom is NOT likely to be caused by insect infestation? PEB Pg42
- leaf droop
- yellow specks
- off-color foliage
- leaves with a scorched appearance - ANS-Leaves with a scorched appearance
What insect listed below is classified as having piercing or sucking mouthparts? PEB
Pg43
- leafhoppers
- Beetles
- weevils
- borers - ANS-leafhoppers
What herbicide type eliminates the whole of the plant over a short period of time? PEB
Pg43
- Pre-emergent
- Contact
- Systemic
- Drench - ANS-systemic
If a tree is suffering from girdling root, what is most likely NOT an advisable action? PEB
Pg43
- Remove the largest roots first
- Remove only the smallest roots
- Remove the tree
- None of the above - ANS-Remove the largest roots first
,Which of the following is NOT classified as an insect? PEB Pg43
- Mites
- Beetles
- Moths
- Caterpillars - ANS-Mites
What statement below is FALSE regarding vascular disease? PEB Pg44
- Examples include Dutch elm disease and oak wilt
- it is treatable if found in a reasonable timeframe
- it affects the flow of water and nutrients
- it originates from pathogens entering the plant - ANS-it is treatable if found in a
reasonable timeframe
Cellulose and lignin are a defense mechanism against predators by what means? PEB
Pg44
- they give off an unfavorable flavor
- They can't be digested
- they have a poor taste
- They are toxic - ANS-They can't be digested
A tree exhibits wounded areas of the lower trunk and some physical damage to surface
roots. What is most likely the cause of injury? PEB Pg44
- Frost
- Poor soil conditions
- Lawnmower or machinery
- disease - ANS-lawnmower or machinery
What is not one of the primary functions of the energy produced by photosynthesis?
PEB Pg44
- maintenance
- growth
- aesthetics
- defense - ANS-aesthetics
What statement below is TRUE regarding how a tree's growth rate and photosynthesis
rate will react to the amount of available resources? PEB Pg45
- The growth rate will be limited before the photosynthesis rate
- The photosynthesis rate will be limited before the growth rate
- The photosynthesis and growth rate become hindered equally with
limited resources
- The photosynthesis rate will not be hindered by limited resources - ANS-The growth
rate will be limited before the photosynthesis rate
What single resource has the most detrimental effect on a tree's ability to perform
photosynthesis if limited? PEB Pg45
,- Light
- Water
- CO2
- None of the above - ANS-None of the above
What extract listed below is NOT an allelochemical classified as a natural insecticide?
PEB Pg45
- Nicotine
- Lignin
- Rotenone
- Neem - ANS-Lignin
A tree is identified as being in the mortality spiral when what has occurred? PEB Pg45
- the tree has begun to see detrimental stress factors
- the tree has seen an isolated but severely detrimental stress factor
- Cumulative stress factors have yielded a situation where very few actions can save the
tree.
- Any combination of stress factors has occurred over time - ANS-Cumulative stress
factors have yielded a situation where very few actions can save the tree.
The foundational element of an appropriate response process (ARP) is which of the
following? PEB Pg46
- monitoring
- immediate action
- establish thresholds
- readily available resources - ANS-Monitoring
What is NOT a characteristic of any organism classified as a pest? PEB Pg46
- Threatens health or appearance of plants
- May also contribute to the surrounding landscape
- Provides competition to the local landscape
- Diminishes safety or enjoyment of an area - ANS-May also contribute to the
surrounding landscape
Key stressors are identified by what criteria? PEB Pg46
- universally detrimental site conditions
- Retroactive analysis of stress
- Identifying local pests and conditions which may be detrimental.
- species specific historical stressors - ANS-Identifying local pests and conditions which
may be detrimental.
Key plants can be identified by which of the following criteria? PEB Pg46
- client specific indications
- specific species
- susceptibility to specific pests
- all of the above - ANS-all of the above
, For a threshold temperature of 50°, determine the average degree day unit value for
temperature over a 3-day span of 85°,76° and 82°. PEB Pg47
- 22°
- 26°
- 31°
- 45° - ANS-31°
What statement regarding landscapes with a monoculture of plantings is true? PEB
Pg47
- They are more susceptible to pest problems
- They are less susceptible to pest problems
- they are equally as susceptible to pest problems
- No correlation exists - ANS-they are more susceptible to pest problems
What is NOT one of the three options available for plant health care professionals to
manage pests?
- Manage
- Eradicate
- Suppress
- Prevent - ANS-Manage
What is NOT a means of biological control for pest populations? PEB Pg47
- predators
- pathogens
- parasites
- miticides - ANS-miticides
After application of pesticides, it is found that the original threat has died off, but a new
contingency of mites has developed as a threat. This development is classified as which
of the following? PEB Pg48
- Pest insurgence
- Pest resurgence
- Primary outbreak
- secondary outbreak - ANS-secondary outbreak
What type of alternative pesticide has the potential side effect of phytotoxic injury if used
during dry periods? PEB Pg48
- Insect growth regulator
- Microbial
- Insecticidal soap
- Horticultural oils - ANS-horticultural oils
When valuing the cost of a tree, when is it most appropriate to use the CTLA trunk
formula method? PEB Pg48
- the tree is below a specific height
Questions #2 – PRF
What example of tree stressors can be classified as acute? PEB Pg42
- Lightning strike
- insufficient soil
- poor light exposure
- poor moisture conditions - ANS-lightning strike
What is most likely NOT a possible cause of deformed leaves? PEB pg 42
- spray injury
- air pollution
- anthracnose
- frost - ANS-Air pollution
What tree symptom is NOT likely to be caused by insect infestation? PEB Pg42
- leaf droop
- yellow specks
- off-color foliage
- leaves with a scorched appearance - ANS-Leaves with a scorched appearance
What insect listed below is classified as having piercing or sucking mouthparts? PEB
Pg43
- leafhoppers
- Beetles
- weevils
- borers - ANS-leafhoppers
What herbicide type eliminates the whole of the plant over a short period of time? PEB
Pg43
- Pre-emergent
- Contact
- Systemic
- Drench - ANS-systemic
If a tree is suffering from girdling root, what is most likely NOT an advisable action? PEB
Pg43
- Remove the largest roots first
- Remove only the smallest roots
- Remove the tree
- None of the above - ANS-Remove the largest roots first
,Which of the following is NOT classified as an insect? PEB Pg43
- Mites
- Beetles
- Moths
- Caterpillars - ANS-Mites
What statement below is FALSE regarding vascular disease? PEB Pg44
- Examples include Dutch elm disease and oak wilt
- it is treatable if found in a reasonable timeframe
- it affects the flow of water and nutrients
- it originates from pathogens entering the plant - ANS-it is treatable if found in a
reasonable timeframe
Cellulose and lignin are a defense mechanism against predators by what means? PEB
Pg44
- they give off an unfavorable flavor
- They can't be digested
- they have a poor taste
- They are toxic - ANS-They can't be digested
A tree exhibits wounded areas of the lower trunk and some physical damage to surface
roots. What is most likely the cause of injury? PEB Pg44
- Frost
- Poor soil conditions
- Lawnmower or machinery
- disease - ANS-lawnmower or machinery
What is not one of the primary functions of the energy produced by photosynthesis?
PEB Pg44
- maintenance
- growth
- aesthetics
- defense - ANS-aesthetics
What statement below is TRUE regarding how a tree's growth rate and photosynthesis
rate will react to the amount of available resources? PEB Pg45
- The growth rate will be limited before the photosynthesis rate
- The photosynthesis rate will be limited before the growth rate
- The photosynthesis and growth rate become hindered equally with
limited resources
- The photosynthesis rate will not be hindered by limited resources - ANS-The growth
rate will be limited before the photosynthesis rate
What single resource has the most detrimental effect on a tree's ability to perform
photosynthesis if limited? PEB Pg45
,- Light
- Water
- CO2
- None of the above - ANS-None of the above
What extract listed below is NOT an allelochemical classified as a natural insecticide?
PEB Pg45
- Nicotine
- Lignin
- Rotenone
- Neem - ANS-Lignin
A tree is identified as being in the mortality spiral when what has occurred? PEB Pg45
- the tree has begun to see detrimental stress factors
- the tree has seen an isolated but severely detrimental stress factor
- Cumulative stress factors have yielded a situation where very few actions can save the
tree.
- Any combination of stress factors has occurred over time - ANS-Cumulative stress
factors have yielded a situation where very few actions can save the tree.
The foundational element of an appropriate response process (ARP) is which of the
following? PEB Pg46
- monitoring
- immediate action
- establish thresholds
- readily available resources - ANS-Monitoring
What is NOT a characteristic of any organism classified as a pest? PEB Pg46
- Threatens health or appearance of plants
- May also contribute to the surrounding landscape
- Provides competition to the local landscape
- Diminishes safety or enjoyment of an area - ANS-May also contribute to the
surrounding landscape
Key stressors are identified by what criteria? PEB Pg46
- universally detrimental site conditions
- Retroactive analysis of stress
- Identifying local pests and conditions which may be detrimental.
- species specific historical stressors - ANS-Identifying local pests and conditions which
may be detrimental.
Key plants can be identified by which of the following criteria? PEB Pg46
- client specific indications
- specific species
- susceptibility to specific pests
- all of the above - ANS-all of the above
, For a threshold temperature of 50°, determine the average degree day unit value for
temperature over a 3-day span of 85°,76° and 82°. PEB Pg47
- 22°
- 26°
- 31°
- 45° - ANS-31°
What statement regarding landscapes with a monoculture of plantings is true? PEB
Pg47
- They are more susceptible to pest problems
- They are less susceptible to pest problems
- they are equally as susceptible to pest problems
- No correlation exists - ANS-they are more susceptible to pest problems
What is NOT one of the three options available for plant health care professionals to
manage pests?
- Manage
- Eradicate
- Suppress
- Prevent - ANS-Manage
What is NOT a means of biological control for pest populations? PEB Pg47
- predators
- pathogens
- parasites
- miticides - ANS-miticides
After application of pesticides, it is found that the original threat has died off, but a new
contingency of mites has developed as a threat. This development is classified as which
of the following? PEB Pg48
- Pest insurgence
- Pest resurgence
- Primary outbreak
- secondary outbreak - ANS-secondary outbreak
What type of alternative pesticide has the potential side effect of phytotoxic injury if used
during dry periods? PEB Pg48
- Insect growth regulator
- Microbial
- Insecticidal soap
- Horticultural oils - ANS-horticultural oils
When valuing the cost of a tree, when is it most appropriate to use the CTLA trunk
formula method? PEB Pg48
- the tree is below a specific height
