There are 50 or more reports for the following species as of January 17, 2024.
Report numbers for species do not provide an assessment of the frequency of failure for the species (i.e., how often a species fails relative to its occurrence in a population of trees). Rather, it is likely the data reflect the relative abundance of a species in the areas from which reports are being received. See CTFRP Statistics/Origin of Reports. Also, see Failure Photos for examples of root, trunk and branch failures of the 50 or more group.
| Quercus agrifolia | coast live oak | 767 |
| Pinus radiata | Monterey pine | 580 |
| Cupressus macrocarpa (Hesperocyparis) | Monterey cypress | 544 |
| Eucalyptus globulus | blue gum | 368 |
| Quercus lobata | valley oak | 350 |
| Pinus pinea | Italian stone pine | 191 |
| Liquidambar styraciflua | sweet gum | 168 |
| Fraxnus velutina | Modesto ash | 148 |
| Quercus kelloggii | CA black oak | 148 |
| Sequoia sempervirens | coast redwood | 131 |
| Acacia melanoxylon | blackwood acacia | 124 |
| Pinus halepensis | Aleppo pine | 120 |
| Quercus wislizeni | interior live oak | 114 |
| Eucalyptus sideroxylon | red ironbark | 111 |
| Ulmus parvifolia | evergreen elm | 109 |
| Pyrus calleryana | callery pear | 102 |
| Cedrus deodara | deodar cedar | 91 |
| Quercus chrysolepis | canyon live oak | 86 |
| Pseudotsuga menziesii | Douglas fir | 86 |
| Umbellularia californica | CA bay | 79 |
| Calocedrus decurrens | incense cedar | 78 |
| Pinus attenuata | knobcone pine | 67 |
| Eucalyptus camaldulensis | Red river gum | 54 |
| Eucalyptus viminalis | Manna Gum | 56 |
| Quercus douglasii | blue oak | 51 |
Species Photos
Click on an image for a larger view.
Quercus agrifolia
Pinus radiata
Cupressus macrocarpa
Eucalyptus globulus
Quercus lobata
Pinus pinea
Fraxinus velutina Modesto
Liquidambar styraciflua
Quercus kelloggii
Sequoia sempervirens
Acacia melanoxylon
Eucalyptus sideroxylon
Quercus wislizeni
Quercus chrysolepis
Cedrus deodara
Psedotsuga menziesii
Pyrus calleryana
Pinus halepensis
Ulmus parvifolia
Umbellularia californica
Calocedrus decurrens
Pinus attenuata