University of California
Western Tree Failure Database/California Tree Failure Report Program
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LinkedInAcacia baileyana and Acacia melanoxylon 2016
Acacia
| A. baileyana | A. melanoxylon | |
| Number of reports | 31 | 84 |
| Mean DBH | 16" | 19" |
| Mean age | 21 years | 32 years |
| Mean height | 26' | 27' |
| Season of failure: | ||
| November-April | 90% | 84% |
| May-October | 10% | 16% |
| Trunk failures | 38% | 39% |
| Branch failures | 13% | 17% |
| Root failures | 49% | 44% |
| Sites: | ||
| Residential or street | 55% | 51% |
| Park | 3% | 30% |
| Parking lot | 16% | 7% |
| Other | 26% | 12% |
| Medium/high site use | 74% | 74% |
| Structural defects: | ||
| no decay | 43% | 44% |
| some decay | 57% | 56% |
| dense crown | 61% | 33% |
| failed portion dead | 48% | 5% |
| codominance | 19% | 20% |
| Mean branch diameter | 10" | 12" |
| Failure at attachment | 4 of 5 cases | 15 of 18 cases |
| Mean ht. of trunk failure | 2' | 6' |
| Mean diam. of trunk failure | 21" | 16" |
| Trunk fail at ground level | 5 of 10 cases | 19 of 37 cases |
| Wind: | ||
| <5mph | 3% | 10% |
| 5-25mph | 29% | 23% |
| >25mph | 68% | 67% |
| Precipitaion: | ||
| none | 25% | 34% |
| some | 75% | 66% |