CATS Urban Tree Risk Assessment & Mitigation 2

Question 1

Which root defect is most commonly associated with trees planted too deeply in urban settings?

Accepted Answer

Circling roots

Answer

Circling or girdling roots frequently develop when trees are planted too deeply or confined in pots, restricting vascular flow and structural stability.

Question 2

When applying the ISA tree risk assessment matrix, a 'Likelihood of Failure' rated as 'Probable' combined with 'Consequences of Failure' rated as 'Significant' produces what overall risk rating?

Accepted Answer

High

Answer

The ISA matrix places Probable likelihood × Significant consequences in the High risk category.

Question 3

Which tool is most appropriate for detecting internal decay in a standing urban tree without causing additional wounding?

Accepted Answer

Resistograph

Answer

The Resistograph uses a fine drill to measure resistance and detect voids or decay with minimal wounding compared to increment borers.

Question 4

A mature cottonwood overhangs a busy pedestrian walkway in Albuquerque. The primary target category that drives risk rating in this scenario is:

Accepted Answer

Occupancy rate of the target

Answer

Target occupancy—how frequently people or property occupy the impact zone—is the key factor in determining consequence severity.

Question 5

What mitigation action best reduces the likelihood of failure for a co-dominant stem union with included bark?

Accepted Answer

Structural cabling

Answer

Structural cabling limits the independent movement of co-dominant stems, reducing stress at the weak union with included bark.

(CATS) Certified Arborist Tree Service of Albuquerque Practice Test

(CATS) Certified Arborist Tree Service of Albuquerque Practice Test

CATS Urban Tree Risk Assessment & Mitigation 2