It depends on the problem, the affected part of the tree, the risk of the pathogen spreading, and the overall health of your tree. Many diseases, fungal infections, and insect infestations can be successfully treated, especially if the issue is only in a few branches. However, if a disease is too widespread, too severe, too easily spread, or in the roots, the tree will likely need to be removed.

According to scientists at Penn State University, spotted lanternflies do not typically kill the trees and plants they feed on, but they can cause branches and segments to die off. However, they have been found to kill cultivated grapes, which can have devastating consequences for vineyard owners and regions that heavily rely on vineyards to create jobs and generate revenue. They have also killed the Ailanthu altissima, known as the tree of heaven, though this is classified as a noxious and invasive weed tree.

Deciduous shade trees (the type of trees whose leaves fall off in autumn) need to be pruned in late winter—between February and March. That’s because it’s easier to find and remove sick or dead branches when no leaves are present. And wounds close and heal faster in colder temperatures so pruning them at this time also makes them less prone to infection.

The cost of professional tree trimming averages $460, with a typical range between $200 and $760. However, prices can be as low as $75 or as high as $1,800 depending on several factors. The size and type of the tree are major cost drivers; for example, trimming Crepe Myrtle trees costs an average of $80 to $400, while trimming giant pine trees can range from $200 to $1,800. Other factors that influence the price include the time of year, as services are often more costly in the spring. The tree's accessibility and your location also play a role, as a remote or hard-to-reach tree may increase the cost. Some professionals may offer a discount if you have multiple trees to trim.