Predicting Limb Breakage

What does that mean?

What are some of the symptoms to look for?

decay at dogleg of Japanese pagoda tree
                                                                              Decay and dogleg on Japanese pagoda tree
What should I do if I see these symptoms? Where can I get more information?

Minnesota Department of Natural Resources, and USDA Forest Service. 1996. How to Recognize Hazardous Defects in Trees. USDA Forest Service NA-FR-01-96. 20 pp.  Can be downloaded or ordered off the Hazard Tree Web Page.  For other information, advice and help on this topic, call offices of your State Urban Forestry Coordinator or University Extension service, or visit urban forestry web sites.