What is "UV exposure risk" in the context of tree trimming?

"UV exposure risk" in the context of tree trimming refers specifically to the potential for sunburn to tree bark after significant pruning. When a tree is heavily pruned, it can expose previously shaded bark to direct sunlight. This sudden increase in UV rays can damage the bark, leading to sunburn, which can cause a range of problems for the tree, including weakened structure, increased susceptibility to pests and diseases, and potential long-term health issues. Understanding this risk is crucial for proper tree maintenance and ensuring the tree remains healthy after trimming operations.