Hero Image

Urban Forestry

Helpful Resources

Fire in California Resources 

Integrated Pest Management 

Free Invasive Shot-Hole Borer Online Course


Tree Pest Hotline

Connect with us!

Invasive Shot Hole Borer (ISHB)

Two closely related species of small, non-native beetles and the fungi they carry pose an imminent threat to millions of trees in Southern California. Invasive shot hole borers (ISHB) attack a wide variety of tree species including commercial avocado groves, common landscape trees and native species in urban and wildland environments.

These beetles tunnel into tree trunks and branches creating channels called galleries. In the process, they introduce fungi that grow in the galleries and later serve as the food source for ISHB larva. The fungi also destroy the food and water conducting systems of the tree, eventually causing stress, dieback and ultimately death of the tree.

For more information about invasive shot hole borers, please visit ishb.org

Invasive Shot Hole Borer ISHB

Contact Info

Photo of Beatriz Nobua-Behrmann Ph.D.
Beatriz Nobua-Behrmann Ph.D.
Title: Urban Forestry and Natural Resources Advisor
South Coast Research and Extension Center
7601 Irvine Blvd.
Irvine, CA 92618
Phone: (949) 301-9182 Ext 1006
Email: benobua@ucanr.edu
Photo of Randall Oliver
Randall Oliver
Title: ISHB Communications Coordinator
UC ANR: Integrated Pest Management
2801 Second Street
Davis, CA 95618-7774
Phone: 9493019182 ext 1012
Email: rdoliver@ucanr.edu
Photo of Hannah R Vasilis
Hannah R Vasilis
Title: Statewide Survey and Trapping Coordinator
Specialty: Invasive Shot Hole Borer/Fusarium Dieback
South Coast Research and Extension Center
7601 Irvine Blvd
949 301-9182 x1007
Irvine, CA 92618
Phone: 949 301-9182 x1007
Email: hrvasilis@ucanr.edu
Photo of Gabe Verduzco
Gabe Verduzco
Title: Staff Research Associate
Specialty: surfing
Email: giverduzco@ucanr.edu