Sudden Oak Death

disease1Sudden oak death (SOD) is the common name for a fatal tree disease caused by Phytophthora ramorum, a species of oomycetes that are similar to fungi.  SOD is one of 59 species of Phytophthora, all of which cause disease in plants.  Many Phytophthora species attack roots in poorly drained or anaerobic soils.  The primary hosts are coast live oak, California black oak, Shreve oak, tan oak, and canyon live oak.  Many more cultivated species are likely susceptible to P. ramorum.  Symptoms in other species are often expressed as leaf blight. P. ramorum can cause foliar disease in Douglas-fir, coast redwood and California bay laurel.  Unlike many Phytophthora species that infect roots, P. ramorum is mainly a foliar pathogen.


Leaves will appear drought- stressed, sometimes turning dull green, yellow, red, or purple as they wilt. Infected bark will be is water- soaked, with red-brown discoloration and has a disagreeable odor. Bleeding cankers form at the base of the trunk and eventually lead to death. P. ramorum infection is usually followed by beetle infestation and/or an alternate pathogen infection.

SOD symptoms are very similar to other common fungal infections. A positive identification of the disease requires sending a tissue sample to a qualified lab.

Info Source: Arborjet

Trees will recover from infestation and will be protected from this disease after the effective treatment that Joe’s Tree Care offers. We have certified arborists that can help you keep your trees health! Call us today! 512-215-1551