The answer to 'why is my fence dead trees' is that the dead trees are likely not actually part of your fence, but rather trees that have died and are leaning against or near your fence. Common causes for dead trees near a fence include disease, drought, insect damage, or old age. Symptoms may include wilting, discolored leaves, and branches that break easily.
To address this issue, you'll need to remove the dead trees as soon as possible. This is generally a job best left to a professional tree service, as removing large, dead trees can be dangerous. They have the proper equipment and expertise to safely take down the trees without damaging your fence or other property. Once the dead trees are removed, you can assess any damage to your fence and make necessary repairs.