Look for dead branches in and out of the canopy. The first symptoms of some problems are leaves on one or more branches that are smaller than leaves on other parts of the tree. Be sure to inspect the trunk closely for signs of boring insects or canker diseases. Despite all efforts to keep plants healthy, some problems will occur. Prompt detection followed by accurate diagnosis of the problem will aid in dealing with the pest or condition affecting the plant.
Accurate diagnosis is the first step in a successful control program.
Most garden centers, retail nurseries and Cooperative Extension Service offices can diagnose plant problems for you. Trying to diagnose the problem by talking to neighbors can lead to a wrong diagnosis unless the neighbors are experienced and knowledgeable in caring for plants. Books may show a plant or pest that looks similar to the problem your plant is having but it may or may not be the same problem. Most books do not describe all the possible problems a plant may have. If you decide to seek a diagnosis of your plant problem based on a sample submitted to a diagnostic lab, be sure to collect and preserve the sample properly.