Asian Oak Weevil - Blog Posts

Asian Oak Weevil (Cyrtepistomus castaneus), taken May 25, 2025, in Georgia, US

A little oak weevil resting in the bend of a leaf! I happened to see this guy through a small gap in the leaf and turned it over to find this cute scene! He may be sleeping, as the weather was quite spotty and poor to travel in, but he could also just be chill like that. C. castaneus was introduced to the US from Japan in the early 1900s and has since spread throughout the Eastern US and SE Canada. They are considered invasive in some states due to native foliage damage brought on by infestations. Their patterning is quite variable—this is actually the first gray one I've ever found. Usually they're a matte brown for me, but they can also be nearly white. Many even have yellow or teal sides, which can faintly be seen in this individual, though not as brightly as some.