We can all be relieved that vandalism was not the culprit of the sequoia bark removal.
According to a letter from Larry Maginnis, the Urban Forestry Supervisor,
“I am writing to put your mind to ease in regards to the bark you have found that was removed from the tree. I visited the site shortly … and determined that what you witnessed was simply bark sloughing off due to some borer/beetle activity beneath the bark. After careful evaluation of some other trees, I noticed there was activity in several others. They leave a tell tale sign by the sawdust type frass beneath the bore holes. The bark was simply undercut by continual activity.
I am including a link regarding the insect here: http://www.ufei.org/ForesTree/files/collected/cedarbeetle.pdf
As always, certain levels of insect activity is good. If we notice an epidemic we can re-evaluate our management strategy. I suggest we sit back and monitor/evaluate at this time.”
Thanks to Larry for his observations and apologies for wrongly assuming vandalism. Any noted vegetative damage in the future will be first taken to Larry.