What is the term for the abnormal growth of new shoots originating from the same point on a plant?

The term "witches' broom" refers to the abnormal growth of new shoots that emerge from the same point on a plant, typically resulting in a dense cluster or mass of stems or branches. This phenomenon can be caused by various factors, including viral infections, fungal infections, or environmental stressors, and is characterized by the abnormal proliferation of shoots that can negatively affect the plant's health and vigor.

The unique growth form resembling a broomstick is where the name derives, as the clustered shoots can create a broom-like appearance. Understanding this term is essential for diagnosing plant health issues and implementing necessary management practices in horticulture and agriculture.

In contrast, the other options represent different plant health issues: crown gall is associated with tumor-like growths caused by bacteria, root rot refers to the decay of roots typically due to excessive moisture or pathogens, and dieback involves the progressive death of plant parts, usually starting from the tips or edges.