I have 2 snowball trees, both have holes bored into them from some type of large bugs. They actually look kind of like black bumble bees. Some are black and some are yellow/light brown color. Does anyone know what they would be? Are they dangerous? They seem to be killing my 2 trees. I cut one of the thick branches they had several holes and 9 of those bugs flew out at me.
If there is a California Cooperative Extension office operating near you during hours when you are available try taking your information to them and seeing if they know the insect. This is a good idea anyway so they are kept informed of the occurrence of pest insects in the area. Ideally you would trap example(s) of the bugs themselves and take those in.
