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Guam CRB Before and After Pics

September 23, 2016

The coconut rhinoceros beetle (CRB) was first detected on Guam at Tumon Bay in 2007. Despite eradication efforts, by 2010 CRB had spread island-wide.  In 2013 a single CRB was found on Joint Base Pearl Harbor-Hickam in a red palm weevil trap near Hickam Air Field which is jointly operated with Honolulu International Airport.  I still vividly remember, as natural resources manager of the base, getting the call from my friend at the State Department of Agriculture just before Christmas and the craziness that ensued in the following months.  That is a story worth telling some other time, but for now I just want to share some photos from Guam that show how destructive this invasive species and pest of palm trees can be.

In 2014 I had the awesome opportunity to attend the USGS Brown Tree Snake Rapid Response Training Course.  It was one of the most fun things I’ve done in a long time.  Perhaps it was because I don’t get the chance to go to Guam any more, or maybe it was just that I love searching for and catching snakes, but I really had a great time.  I knew that CRB had hit Guam particularly hard, and also I knew that most folks in Hawaii don’t realize that we can potentially experience the similar impacts, so I decided the trip would be a good opportunity to get some photos of CRB damage. Furthermore, I thought it would be cool if I could find some pics on the internet of pre-CRB areas or early CRB areas with healthy coconut palms, then I could recreate the photos in 2014 to show how the trees had changed.  It didn’t quite turn out as I had hoped, but here are the photos.


These photos are of the same section of coconut palms along the beach side of the War in the Pacific National Historic Park, Asan Beach.  The top photo was taken by an unknown photographer in 2009 (can’t find it on the internet anymore so don’t know who to give credit to) and the bottom photo was my attempt to replicate the photo in 2014.

War Memorial Overlook 2014b4 copy.jpg

Images of palm trees again from the Asan Beach Ware in the Pacific National Historic Park, but they were taken in a different area.  Top photo from the internet was taken in 2002 and bottom photo was recreated by me in 2014.


These photos were taken at the Agat Unit – Ga’an Point location of the War in the Pacific National Historic Park – the top was taken in 2013 and the bottom was recreated by me in 2014.

From these pictures alone the damage over the years does not seem to be catastrophic, although it does look like the trees overall area thinner and less full in 2014.  There were some areas of the Asan Beach Memorial that were being hit very hard.  The following are some pics of some of the CRB damage that was more obvious.  These were all taken in 2014. I’ve got my fingers crossed that I will go back to Guam this year for BTS refresher training.  If that is the case I hope to replicate these photos again.

War Memorial Overlook 2014b2b copy.jpg

Long view of Asan Beach War Memorial Park.  See photos below with corresponding numbers in captions for close ups of tree damage.


Photo 1. Notched fronds are characteristic of CRB damage..


Picture 2. More damaged fronds.


Photo 3.


Photo 4.


Photo 5.


Photo 6.


Photo 7.


Photo 8.


Photo 9.  This area was actually fence off because it was unsafe.  Some of these palms were damaged so much they have died and may fall over.


Photo 10.

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