Certified Arborist Test Diagnosis and Treatment Questions and Answers

Question 1

An arborist inspects a pin oak (Quercus palustris) growing in a landscape with a high soil pH.
The newest, youngest leaves show distinct yellowing between the veins, while the veins themselves remain green.
What is the most likely diagnosis?

Accepted Answer

Iron deficiency

Answer

Nitrogen deficiency

Answer

Anthracnose

Answer

Drought stress

Question 2

While examining a declining ash tree (Fraxinus spp.), you discover numerous D-shaped exit holes, each approximately 1/8-inch in diameter, on the trunk and major branches. Which insect pest is the most probable cause of this damage?

Accepted Answer

Emerald ash borer

Answer

Asian longhorned beetle

Answer

Banded ash clearwing borer

Answer

Redheaded ash borer

Question 3

Which of the following is the best example of a cultural control practice within an Integrated Pest Management (IPM) program?

Accepted Answer

Improving soil aeration and drainage to enhance tree vigor.

Answer

Releasing parasitic wasps to control an aphid population.

Answer

Applying a targeted insecticide to manage a scale infestation.

Answer

Installing pheromone traps to monitor for pest activity.

Question 4

A client points out a large, woody, shelf-like fungal growth, known as a conk, at the base of a mature maple tree. The tree's canopy currently appears healthy. What does the presence of this conk signify?

Accepted Answer

The tree has an advanced stage of internal wood decay.

Answer

It is a harmless, superficial fungus living only on the outer bark.

Answer

The tree is suffering from a minor foliar disease.

Answer

It is a sign of recent, severe insect borer activity.

Question 5

An arborist must fertilize a mature tree in a heavily compacted clay soil lawn. Which application method is most effective for delivering nutrients directly to the root zone and bypassing the compacted surface layer?

Accepted Answer

Subsurface liquid injection

Answer

Surface broadcast of granular fertilizer

Answer

Foliar spray application

Answer

Trunk implantation of fertilizer plugs

Question 6

Which of the following observations is most characteristic of an abiotic disorder rather than a biotic problem?

Accepted Answer

Symptoms appear suddenly and uniformly across several different, unrelated plant species in one area.

Answer

The problem seems to spread progressively from one tree to another over time.

Answer

Fungal hyphae or insect frass is visible upon close inspection of damaged tissue.

Answer

Symptoms are localized to a single branch on an otherwise healthy tree.

An arborist inspects a pin oak (Quercus palustris) growing in a landscape with a high soil pH.The newest, youngest leaves show distinct yellowing between the veins, while the veins themselves remain green.What is the most likely diagnosis?

An arborist inspects a pin oak (Quercus palustris) growing in a landscape with a high soil pH.
The newest, youngest leaves show distinct yellowing between the veins, while the veins themselves remain green.
What is the most likely diagnosis?