When will the 2016 SOD Blitz and training sessions be held?

SOD Blitzes include a training session for blitz volunteers on SOD and proper sampling, followed by time in the field  for collecting and marking sample locations. All necessary collection materials are provided to volunteers during the training session for use either the same day of the training or the day after. All samples are to […]

What can cause leaf tip scorch on redwood trees?

Leaf tip scorch symptoms on redwood trees are found from the lower to upper canopy and include healthy leaves interspersed with brown and grey leaves or portions of leaves. Grey leaves typically have black margins into the healthy tissue. Such symptoms are typically caused by a fungus called Pestalotiopsis funerea. They are commonly associated with […]

What are the modifications required for drone canopy leaf sampling?

Make sure the prop blades are protected. Modify the tail to include a collection device.  A very sharp blade at a sharp angle allows twigs to be cut off and often to remain caught in the space between the blade and tail. Learn how to drive the drone using the camera. For more on drones […]

Do azomite fertilization and lime wash treatments help control SOD?

Based on the study published by the UC Berkeley Garbelotto lab in California Agriculture (http://nature.berkeley.edu/garbelotto/downloads/calag2009.pdf), azomite and/or lime washes alone are not effective in controlling SOD.

Will the spray application for SOD prevention be updated like the injection application was?

While phosphonate injections to help control SOD are now recommended once every 2 years, spray applications should still be applied to the bark of oak trees annually.

Can poison oak leaves be infected by Phytophthora ramorum?

The stems of poison oak plants can be infected by Phytophthora ramorum (the plant pathogen known to cause SOD); however, we do not know if leaves can be.

Can poison oak leaves get infected by Phytophthora ramorum?

The stems of poison oak plants can be infected by Phytophthora ramorum (the plant pathogen known to cause SOD); however, we do not know if leaves can be.

Bark beetles are attacking my oak. Will they kill the tree? What should I do?

Once bark beetles attack the main stem (trunk) of an oak, the tree is on its way out.  Insecticide treatments will not save it. Oak beetles are attracted to trees that are severely compromised.  They cannot attack healthy trees. The correct approach to avoid bark beetle infestations is not to apply insecticides, but rather to […]

My coast live oak trunk is oozing. I sprayed the bark in January. Can you estimate how long it will be before the tree fails and we have to remove it?

The symptoms on your oak may be caused by a range of issues. If oozing is accompanied by the presence of fine sawdust, then the tree is dying. Even if it is still green you may want to consider removing it if its failure may cause harm to people or property. The fine sawdust is […]

What are the revised SOD treatment recommendations that were released in June 2015?

The revised SOD treatment recommendations can be found at:  https://nature.berkeley.edu/garbelottowp/?p=1039.

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