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UC IPM Home > Homes, Gardens, Landscapes, and Turf > Fruits and Nuts > Diseases
How to Manage Pests
Pests in Gardens and Landscapes
Phytophthora root
and crown rot
Phytophthora root rot is characterized by beads of sap found on the tree trunk. Cracking may also occur
on the trunk. Fruit may be partially covered with brown spots.
Solutions
The key factor in reducing the threat of root and crown rot is good water
management. Good soil drainage
is best provided before planting. Plant
on mounds made by working
up the soil. Never cover the graft union with soil and do
not water the crown area directly. If you suspect crown rot,
carefully cut away affected bark at the soil line. Trees
can sometimes be saved by removing soil from the base of
the tree down to the tops of the main roots and allowing
the crown tissue to dry out. Tolerant rootstocks may help
prevent infection.
For more information, see the Phytophthora
Root and Crown Rot Pest Note. | 
Fruit symptoms of P. citricola
Beads
of sap on tree trunk
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