RT Journal Article SR Electronic T1 Validation of a Tree Failure Evaluation System JF Arboriculture & Urban Forestry (AUF) JO JOA FD International Society of Arboriculture SP 233 OP 234 DO 10.48044/jauf.1995.037 VO 21 IS 5 A1 Gary W. Hickman A1 Ed Perry A1 Richard Evans YR 1995 UL http://auf.isa-arbor.com/content/21/5/233.abstract AB In 1987, 695 oak trees, Quercus lobata and Q. wizlizenii were 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.