Identifying and Treating for Sudden Oak Death

Identifying and Treating for Sudden Oak Death

Sudden Oak Death received its name because of the apparent rapid decline and death of oak trees. In reality the pathogen is present in trees long before the trees decline. Oaks in the red oak family are susceptible to SOD (Sudden Oak Death). This includes live oaks and black oaks and additionally tan oaks are affected. White oaks such as the oregon white oak or valley oak are not susceptible to SOD. Shreve Oaks, big leaf maples and california bays are also affected by SOD. Bay trees are believed to be the primary host specie. Bleeding and cankers on the trunks of oaks may indicate the presence of the SOD pathogen Phytopthera ramorum. Bleeding may also be caused by the presence of oak bark beetles, western sycamore borer or oak ambrosia beetles. Holes in the bark of trees with frass present is caused by beetle or borer infestation. Frass is sawdust type material and can be dark or light in color depending on the type of insect present. Black rounded growths known as Hypoxylon may indicate the presence of SOD but can also be present on dead limbs or trunk tissue without the presence of SOD. Sampling can be performed by Certified Arborist Ron Wallace who has State Training for SOD sampling. Samples are submitted to the State of California Department of Food and Agriculture. Treatment for Sudden Oak Death The California Department of Pesticide Regulation has issued a Special Local Needs Label for phosphonate products for treatment of SOD. Ron Wallace of TreePro is a Licensed Qualified Applicator licensed to treat oaks for SOD. Treatment for SOD involves spraying the lower eight to ten feet of tree trunks with Agri-Fos Systemic Insecticide with Pentra-Bark (Bark Penetrating Surfactant). It is important to treat trees within six months of displaying the bleeding symptoms. The phosophonate fungicides are not considered a cure but have been effective at reducing the disease in treated trees and prolonging the life of affected trees. Another important management technique for SOD is to monitor and prune california bay trees growing close to oaks trees in the landscape. Check the tips of leaves for brown or black discoloration. This discoloration may be an indication of the prescence of SOD on the bay tree. Pruning back or removing bays growing near oaks will reduce the likelihood of the SOD pathogen spreading to adjacent oak trees. Contact TreePro for an evaluation and management plan for the oaks in your home landscape. Our Certified Arborists are trained to identify and treat your valuable trees. For more information on Sudden Oak Death visitwww.suddenoakdeath.org or Cal Fire's website at www.fire.ca.gov/

Identifying and Treating for Sudden Oak Death

By: TreePro

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