ISA Arborist Certification Test Questions and Verified Answers Newest Update (2025 / 2026), 100% Guaranteed Pass

ISA Arborist Certification Test Questions and Verified
Answers Newest Update (), 100%
Guaranteed Pass




1. What example of tree stressors can be classified as acute? PEB Pg42
ji ji ji ji ji ji ji ji ji ji ji




- Lightning strike ji




- insufficient soil ji




- poor light exposure
ji ji




- poor moisture conditions
ji ji




…Ans>> lightning strike ji ji




2. What is most likely NOT a possible cause of deformed leaves? PEB pg 42
ji ji ji ji ji ji ji ji ji ji ji ji ji




- spray injury ji




- air pollution
ji




- anthracnose
- frost
…Ans>> Air pollution jiji ji

,3. What tree symptom is NOT likely to be caused by insect infestation? PEB
ji ji ji ji ji ji ji ji ji ji ji ji




ji Pg42
- leaf droop
ji




- yellow specks ji




- off-color foliage ji




- leaves with a scorched appearance
ji ji ji ji




…Ans>> Leaves with a scorched appearance
jiji ji ji ji ji




4. What insect listed below is classified as having piercing or sucking mouth-
ji ji ji ji ji ji ji ji ji ji ji




ji parts? PEB Pg43
ji ji




- leafhoppers
- Beetles
- weevils
- borers
…Ans>> leafhoppers jij




5. What herbicide type eliminates the whole of the plant over a short period of
ji ji ji ji ji ji ji ji ji ji ji ji ji




ji time? PEB Pg43
ji ji




- Pre-emergent
- Contact
- Systemic
- Drench
…Ans>> systemic jij

,6. Ifatreeissufferingfromgirdlingroot,whatismostlikelyNOTanadvisable
ji ji ji ji ji ji ji ji ji ji ji ji ji ji




ji action? PEB Pg43 ji ji




- Remove the largest roots first ji ji ji ji




- Remove only the smallest roots ji ji ji ji




- Remove the tree ji ji




- None of the above
ji ji ji




…Ans>> Remove the largest roots first jiji ji ji ji ji




7. Which of the following is NOT classified as an insect? PEB Pg43
ji ji ji ji ji ji ji ji ji ji ji




- Mites
- Beetles
- Moths
- Caterpillars
…Ans>> Mites jij

, 8. What statement below is FALSE regarding vascular disease? PEB Pg44
ji ji ji ji ji ji ji ji ji




- Examples include Dutch elm disease and oak wilt ji ji ji ji ji ji ji




- it is treatable if found in a reasonable timeframe
ji ji ji ji ji ji ji ji




- it affects the flow of water and nutrients
ji ji ji ji ji ji ji




- it originates from pathogens entering the plant
ji ji ji ji ji ji




…Ans>> it is treatable if found in a reasonable timeframe
jiji ji ji ji ji ji ji ji ji




9. Cellulose and lignin are a defense mechanism against predators by what ji ji ji ji ji ji ji ji ji ji




ji means? PEB Pg44 ji ji




- they give off an unfavorable flavor
ji ji ji ji ji




- They can't be digested ji ji ji




- they have a poor taste ji ji ji ji




- They are toxic ji ji




…Ans>> They can't be digested jiji ji ji ji




10. A tree exhibits wounded areas of the lower trunk and some physical
ji ji ji ji ji ji ji ji ji ji ji




ji damage to surface roots.What is most likely the cause of injury? PEB Pg44
ji ji ji ji ji ji ji ji ji ji ji ji ji




- Frost
- Poor soil conditions ji ji




- Lawnmower or machinery ji ji




- Disease
…Ans>> lawnmower or machinery jij ji ji