Chapter 4 Tree Concerns and Removal
At a much slower rate, trees respond to viruses and bacteria just as humans do. xvii If a tree is already in a weakened state, its defense mechanisms may not be able to stave off diseases. Despite our best tree care efforts, there are times when an individual tree shows stress or disease. Few tree owners have the trained eye of an arborist or horticulturist, but trees often display symptoms that tell you when it’s time to call a professional to assess the tree’s condition. In the Tree Owner’s Manual for the Northeastern and Midwestern United States, developed by the USDA Forest Service, the agency provides a chart and we have compiled a chart on the following page to help identify potential problems. As an example of how homeowners or businesses can monitor trees for signs of trouble, pay close attention to look for changes in your favorite tree. Take a photo of the condition of the tree each year to observe changes. Monitor to see if there is consistent change that is cause for concern. Dieback of leaves or limbs within a tree might mean the tree has contracted blight. A tree expert can provide an accurate diagnosis and recommend treatment before the condition becomes worse. Often, there are remedies that can get your tree back on track for a long life.
Bacterial leaf scorch on an American Elm.
Powdery mildew on an oak.
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