Summary data for root failures 12/08/11.
This data does not include data from the wind event of 11/30/11-12/02/11
The database contains 5264 reports. 1790 are root failures.
| % of all failures | % of root failures | |
| Quercus | 23% | 26% |
| Pinus | 18% | 20% |
| Eucalyptus | 12% | 11% |
| Cupressus | 9% | 10% |
| Fraxinus | 3% | 3% |
| Acacia | 3% | 4% |
| Ulmus | 3% | 2% |
| Liquidambar | 2.6% | 0.2% |
| Cedrus | 2% | 1% |
| Sequoia | 2% | 2% |
| Pyrus | 2% | 1% |
Mean age: 65 years
Mean height: 53 ft.
Mean DBH: 26 inches
Pruning at point of failure from 1591 reports
Root pruning: 113 (7%)
No pruning: 1478 (93%)
Pruning of whole tree from 1499 reports
Some pruning (all types): 698 (47%)
No pruning: 732 (49%)
Other: (4%)
Structural defects (not decay) Up to three choices are permitted in this field. the following lists the number of times a defect was chosen from 1582 reports.
None: 306, Lean: 238, Dense crown: 201, Failed portion dead: 174, Kinked/girdling roots: 173, Other: 159, Onesided: 137, Multiple trunks: 117, Heavy lateral limbs:112, Top heavy: 80.
Decay
Some: 866 (48%)
None: 761 (43%)
Unknown or not reported: 163 (9%)
Restricted roots
Raised planter or bed: 81, Container or boxed tree: 17, Root bariers: 72, Root cutting: 184, N/A or data missing: 1436
Soil from 1642 reports
Good condition: 18%, Compacted: 12%, Saturated: 57%, Dry: 6%, Shallow: 4%, Other: 3%.
Wind from 1567 reports
Less than 5mph: 16%, 5-25 mph: 26%, more than 25 mph: 58%
Precipitation from 1621 reports
Some: 76%, None 24%