Citrus Pest Quick Guide: Ambrosia Beetles (broadly used common name)

Close-up photo of a very tiny beetle on a bright new penny; beetle is longer than Abraham Lincoln's nose on the penny, but not by much.

A one-page quick guide written by Lauren M. Diepenbrock and Jamie D. Burrow and published by the Entomology and Nematology Department presents the life cycle of the ambrosia beetle and provides several photos of the pest and the damage it causes to assist in identification.
https://edis.ifas.ufl.edu/in1283