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SPN Southwest Regional Chapter

This chapter of the Sentinel Plant Network provides regionally focused resources about high-consequence plant pests and diseases so that member gardens can monitor, identify and respond to these threats more effectively. The online discussion space enables members from different gardens to communicate about emerging issues with one another and with other stakeholders from the Southwest region such as diagnosticians from the National Plant Diagnostic Network and regulatory officials from the USDA's Animal and Plant Health Inspection Service.

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Polyphagous Shot Hole Borer found at South Coast Botanic Garden

PSHB has caused great damage to Cockspur Coral Tree, Erythrina crista-galli. The identity of the PSHB has been confirmed by Gevork Arakelian, Senior Biologist, County of Los Angeles. I found the beetles on several other trees around the Cockspur Tree. The first is Silk Tree, Albizia julibrissin. This one had sap coming out of the entry holes. I found a PSHB dead and trapped in the sap. This tree has good defenses! Also Kaffirboom Coral, Erythrina caffa, and E. lysistemon have the Borer. These other Coral Trees are not showing as much decline as the Cockspur Coral Tree. We are an 87 acre arboretum and have great tree diversity. If you are interested in any other possible host for the PSHB I am happy to check out a particular tree for you. I hope this is helpful. Pedra Sage