Which of the following statements about Tree Growth Regulators is true?

Tree Growth Regulators (TGRs) play a significant role in managing the growth patterns of trees. The statement that they can reduce the frequency of necessary tree care is accurate as TGRs help modify growth habits, which can lead to a more manageable and compact plant structure. By inhibiting excessive vertical growth, these regulators can help maintain the desired size and form of a tree, thereby reducing the need for frequent pruning and other maintenance tasks. This results in not only less labor for the caretaker but also a healthier tree, as it minimizes stress on the plant associated with frequent interventions.

The other statements do not accurately reflect the function and effects of Tree Growth Regulators. While TGRs do have various impacts on trees, they are not designed to enhance disease susceptibility nor are they effective only on new plants; they can be used on both established and younger trees. Additionally, TGRs are intended to moderate growth rather than increase growth rates across all types of trees, as their effects can vary significantly depending on the species and their specific growth characteristics.