How to Manage Pests
Pests in Gardens and Landscapes
Phytophthora root rot—Phytophthora citrophthora and P.
Phytophthora root rot causes a slow decline of trees. Leaves may turn dull green or yellow and may drop.
The center of the root turns soft. Uptake of water and nutrients will be severely limited. The tree will
grow poorly, stored energy reserves will be depleted, and production will decline.
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.
streaks in infected roots