Fire Safe Council
East Orange County Canyons
Suspect your tree is affected?
Go to and click on Diagnosis & Management. Then Click on Identification and select a Tree Species. A photo showing what the symptoms of Shot Hole Borer infestation look like for that tree species will appear.

Chaparral Tree Health Information.  Native Trees create a healthy ecosystem.  Learn how to take care of your trees on the links below.

Many local trees, Sycamore, Oak, and Willow as well as ornamental trees like Japanese Maple, Avocado and more are being killed by the Polyphagous Shot Hole Borer and other pathogens.

This PDF has lots of great information for residents on tree and pest identification: These books show various tree maladies and help identify them.

Tree survey.

CItizen Scientist page 1-11

Citizen Scientist page 12-23

For tree pruning and health tips to keep pathogens from spreading, this PDF has tool cleaning and pruning tips:  Tree care -BMP

Golden Spotted Oak Borer, or GSOB is another pest. Learn how to identify here:GSOB

Tree care, watering and year round tree health in this PDF.

This video by Bea Norbua-Behrmann shows a shot hole borer on a sycamore in Weir canyon.


OCFA news release on Invasive Tree Pests

This video from USFS details how to water your mature trees

Soaker hose info

Tree watering guide

Irrigation requirements for oaks

Invasive Shot Hole Borer is a real danger to the  Southern California landscape.   This disease and insect may kill many Oak, Sycamore and other trees in our area.  Please do not move firewood and click on this link to learn more.
LA Times Article
Shot Hole Borer CISR

Do you think the issue is far away?  We have these killing pests in Trabuco, Modjeska and Silverado Canyons.
Check out this map from OC parks of trees mapped in Modjeska Canyon and the Modjeska home.

Camping in an Orange County Park?  You can't bring firewood in, you must purchase wood there> here is the OC parks policy.

What Can I Do?


Maintain tree health & avoid injury to native trees located on your property. Follow appropriate cultural management practices for irrigation, mulching, pruning, etc.


Dispose of infested wood and greenwaste per the best management practices on how to dispose of infested material found at and


Learn to identify the signs and symptoms of PSHB and GSOB infested trees and report suspect trees using the field identification guides and reporting instructions provided at and


Have a certified arborist treat lightly infested trees or remove heavily infested trees.


Stay informed. Find out the latest news, make use of the resource materials and subscribe to the e-mail lists provided at and