CATS Pruning Standards and Cuts 3

Question 1

Which cut is recommended when removing a branch that has formed a distinct branch collar?

Accepted Answer

Cut just outside the branch bark ridge and collar

Answer

The correct cut follows the angle set by the branch bark ridge on top and stays just outside the collar on the bottom to preserve the tree's natural wound-closure tissues.

Question 2

What is the main objective of crown thinning?

Accepted Answer

Increase light penetration and air movement through the canopy

Answer

Crown thinning selectively removes branches throughout the canopy to improve light and air circulation without significantly changing the tree's overall size.

Question 3

In young tree structural pruning, selecting a dominant central leader typically involves:

Accepted Answer

Subordinating competing co-dominant stems by reducing or removing them

Answer

Subordination pruning reduces the length of competing stems relative to the selected leader, directing energy to the dominant stem.

Question 4

The branch bark ridge (BBR) is important because it:

Accepted Answer

Marks where the final pruning cut angle should begin on the upper side

Answer

The BBR is a raised ridge of bark at the top of the branch union that guides the upper angle of the proper pruning cut.

Question 5

When pruning oaks in Albuquerque to reduce risk of oak wilt transmission, what timing practice is recommended?

Accepted Answer

Avoid pruning during spring when sap-feeding beetles are most active

Answer

Nitidulid beetles that vector oak wilt fungus are most active during spring sap flow, so pruning wounds made then are highly attractive to these vectors.

(CATS) Certified Arborist Tree Service of Albuquerque Practice Test

(CATS) Certified Arborist Tree Service of Albuquerque Practice Test

CATS Pruning Standards and Cuts 3