1. Be sure the problem have been diagnosed correctly. "As with human health, it's a good idea to get a second opinion," says Michael Matheron, Ph.D., extension plant pathologist at the University of Arizona. Call your local county extension agent for advice or go to the Web site of the International Society of Arboriculture (ISA), www.treesaregood.com, to find an ISA-certified arborist in your area.
2. For an accurate diagnosis, ask your local extension agent or arborist to inspect your tree in person. If that's not possible, show them several samples and/or photos of the problem and give a very specific description, says Dr. Matheron. Prepare yourself for these questions:
Your arborist or extension agent will probably ask many more questions.
3. Remember after they have diagnosed the tree to ask for an organic solution!