Landscape changes implicated in root rot
| ACTIONS | NO. OF CASES | SPECIES |
|---|---|---|
| Old (manual) Irrigation was replaced with the new sprinkling system regulated by timer; Sprinkling heads position close to the trunk; Presence of water puddles or moist soil near the root crown | 26 | Alnus rhombifolia, A. cordata, Camellia, Cedrus deodora, C. atlantica, Citrus sp., Cupressus macrocarpa, Ficus carica, Juniperus chinensis, Ligustrum japonicum, Persea americana, Pinus radiata, Prunus laurocerasus, Pyracantha fortuneana, Pyrus calleryana, Quercus agrifolia, Q. lobata, Rhododendron, Schinus molle, Taxus bacata |
| New garden was Installed around the tree, raised flower beds were built aroud the tree base | 18 | Catalpa bignonioides, Cedrus deodora, C. atlantica, Citrus sp., Eucalyptus globulus, Fagus sylvatica, Ficus carica, Juniperus chinensis, Malus sp., Pinus radiata, Quercus agrifolia, Q.lobata, Rhododendron, Salix babylonica, Schinus molle, Taxus bacata |
| New driveway, deck, stone wall, utility line, etc., were constructed | 12 | Acer saccharum, Ailanthus altissima, Fagus sylvatica, Quercus agrifolia, Q.lobata, Q.palustris, Q.suber, Shinus molle |
| Grade was raised - root crown was buried | 6 | Acacia baileyana, A. melanoxylon, Eucalyptus viminalis, Quercus agrifolia, Q.douglasii, Q.lobata, |
| Rhododendrons or azaleas, or camellias were planted under the canopy | 4 | Prunus lauracerarus, Quercus agrifolia, Q.douglassi, Ficus carica |
| Chemical weed control program under the tree drip line was Initiated | 3 | Acacia melanoxylon, Quercus agrifolia |
| Soil poorly drained and compacted around the root zone | 2 | Quercus agrifolia, Q.douglasii |
| New lawn was Installed or the old one was renovated | 3 | Citrus sp., Quercus agrifolia, Q.lobata, Olea europaea |
| Unexplained | 12 | Acacia baileyana, Citrus sp., Fagus sylvatica, Jacaranda mimosifolia, Juniperus chinensis, Nyssa sylvatica, Quercus agrifolia, Q. douglasii, Q. lobata, Rhododendron, Shinus molle |