Shot Hole Borer/Fusarium Dieback
Beetle and Fungal Complex: The Polyphagous Shot Hole Borer (PSHB), Euwallacea sp., is an invasive beetle that vectors a disease called Fusarium Dieback (FD). The disease stops the flow of water and nutrients in over 137 susceptible tree species, which can lead to the death of individual branches or, in severe cases, the entire tree. It is caused by the fungi that the beetle uses as a food source: Fusarium euwallaceae, Graphium euwallaceae, and Paracremonium pembeum. PSHB attacks a wide variety of host species. The beetles bore tunnels (galleries) in which to lay their eggs and grow the fungi.
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