The answer to 'why is my tree disease' is that there are several common causes of tree diseases, including fungal infections, bacterial infections, insect infestations, and environmental stresses. Symptoms may include discolored or wilting leaves, dieback of branches, and overall decline in the tree's health.
Some common tree diseases include oak wilt, Dutch elm disease, and anthracnose. Causes can range from a fungus spreading through the soil to insects feeding on the tree's bark and disrupting the flow of nutrients. Environmental factors like drought, frost damage, or soil compaction can also weaken a tree and make it more susceptible to disease.