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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.