Validation of a Tree Failure Evaluation System
Gary W. Hickman, Ed Perry, and Richard Evans
Abstract: In 1987, 695 oak trees, Quercus lobata and O. wizlizeniiwere evaluated using a nine-component rating system. In 1994, the trees were reevaluated to validate the original system in predicting tree failure. Analysis of the results showed that 3 components [decline (vigor), trunk condition and lean] correctly predicted subsequent tree failure or survival. Decline, a relative measure of leaf cover and color, was the most important factor in predicting total tree failure.