Phytophthora crown and root
rot—Phytophthora megasperma
Symptoms of Phytophthora are typical of many root diseases. Infected vines may be stunted, and foliage
may be sparse and senesce prematurely as greater proportions of the root system became infected. Vines
die rapidly and the inner part of the bark of the crown region appears darkened.
Solutions
Remove infected vines. Keep graft unions of vine trunks
above the soil line to minimize contact with pathogen propagules.
Avoid repeated and prolonged flooding of soil. If using sprinklers,
position nozzles to avoid water runoff down trunks.
For more
information, see the Phytophthora
Root and Crown Rot Pest Note. | 
Stunting
and discoloration of infected plant
Darkened
bark and wood tissues
|
