Small Beetle, Big Problem
Invasive shothole borers (ISHB) are two closely related species of small, non-native, beetles that bore into trees. ISHB introduce fungi that cause a tree disease called Fusarium dieback (FD). The ISHB-FD pest-disease complex is responsible for the death of thousands of trees in Southern California and poses an imminent threat to the integrity of our urban and natural forests.
Invasive shothole borers attack a wide variety of tree species including avocados, common landscape selections, and California native species in urban and wildland environments.
For more information about invasive shothole borers and Fusarium dieback, view the video below and explore this website.
Pests in the Urban Landscape
Invasive Spotlight: Asian Citrus Psyllid and Huanglongbing Disease
The Asian Citrus Psyllid (ACP) is a small, aphid-sized insect that poses a serious threat to California's citrus trees. This invasive pest can carry and transmit a fatal bacterial disease called Huanglongbing (HLB) to all citrus species. HLB has already...
Participatory science project helps protect Southern California trees from invasive beetles
UC ANR program trains volunteers to accurately identify and report infested trees, protecting forests and encouraging civic engagement through participatory science. The Issue Invasive pests are one of the main threats to our urban and natural forests....
NAISMA Blog: Protect Urban Trees from ISHB
In a NAISMA blog post, Dr. Beatriz Nobua-Behrmann, Urban Forestry and Natural Resources Advisor with UC Cooperative Extension, explains how to identify infestations by invasive shothole borers and how you can protect your trees from this...
This website was made possible by support from the US Forest Service Forest Health Protection Program, UC Riverside, Orange County Parks, the California Avocado Commission, and the work and in-kind support of federal, state, and local partners.
ISHB eXtension Training! The course is served by the eXtension national online learning platform.
ISHB Detection & Management Assessment
Before reporting infestations, take the ISHB Detection Assessment to see if your tree is suffering from ISHB damage.