ISA Utility Specialist Practice Exam

The Round-over technique in pruning is considered discredited primarily because it fails to support the natural growth patterns of trees and can lead to various health issues for the plants. This method typically involves cutting back branches uniformly to create a rounded shape, which can lead to excessive regrowth and a more vigorous response from the tree. Such practices can increase the risk of disease and pest infestations as the cuts may encourage new growth that is weak and prone to damage.

In contrast, more modern and recommended pruning techniques focus on enhancing the natural structure of the tree, promoting healthy growth, and reducing the risk of disease. These methods prioritize the removal of dead or diseased branches rather than shaping the tree in an unnatural way as the Round-over technique does. Recognizing this, arborists and horticulturists have moved away from Round-over pruning in favor of approaches that better align with the biological needs of the trees.