Re: Coming to a riparian woodland near you...

Susan Smith

Thanks to Gjon for posting, and birders should be on the lookout for signs of these infestations in the county, becasue this has the potential do deimate what few riparian areas we have.  To add to Gjon's post, at the end of April 2016 i noticed evidence of the shot-hole borer in willows at the San Elijo Lagoon Visitors Ctr trail,and with help of Jeff Clingan, this was photo-documented, SEL park staff and County borer specialists notified. The beetle specialists followed up and took DNA samples, marked trees, and the shot-hole borer presence verified.  I am not sure when these trees will be removed or treated by the county.  I am hoping that the willows there will not succumb as dramatically as the Tijuana River Valley willows have! 

I am also sad to report that since then I have also noted evidence of the shot-hole borer at the following riparian locations:  the east end (El Camino Real entrance)trail at San Elijo Lagoon;  Cottonwood Creek park, Encinitas;  San Dieguito Lagoon east end along the horse park trail; Mast Park;  Flintkote Canyon trail/road Penasquitos Creek, Sorrento Valley; and along Carmel Valley Creek that runs parallel to Hwy 56. I think the beetle may be spread by the dispersal of fallen dead wood into the water, spreading infected wood upstream to downstream.  

Susan Smith
Seiurus Biological  Consulting
Del Mar, CA 

-----Original Message-----
From: 'Hazard, Gjon' gjon_hazard@... [SanDiegoRegionBirding] [SanDiegoRegionBirding]
Sent: Fri, Sep 2, 2016 11:07 am
Subject: [SanDiegoRegionBirding] Coming to a riparian woodland near you...

...and city park, and urban woodland, and orchard, and on, and on: shot-hole borer beetles. 

If you're not familiar with these guys (two species), you should be. They have the potential to be game-changers for large swaths of California habitat. 

Kuroshio Shot Hole Borers are in San Diego Co. (and in Tijuana, Mexico) and Polyphagous Shot Hole Borers are in Orange, LA, Riverside, San Bernardino, and Ventura Counties (and I think now SLO too). 

Climate tolerance tests for the beetles suggests that much of the state could be affected -- and potentially beyond. Willows, sycamores, oaks (to name a few natives) are susceptible. 

Here's a recent news piece on the Tijuana River:

More info (see also links therein, and at many more websites too):

What to watch for, what to do -- see this PDF:


* * *
 Gjon C. Hazard
 Fish and Wildlife Biologist
 U.S. Fish and Wildlife Service, Carlsbad Fish and Wildlife Office
 2177 Salk Avenue, Suite 250, Carlsbad, CA  92008 USA
 Voice: 760-431-9440 x287; FAX: 760-431-5901
 E-mail: Gjon_Hazard

(posted by me for information purposes only; not an official post by the USFWS)

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