Indoor small beetle infestation
For the last few years we have had small green flying beetles show up in our south & east facing kitchen corner window in the late spring in the sunshine. I've been ignoring them until they stopped showing, but this year it has turned into an infestation, with 15-20 new beetles each day. I am guessing that they breeding in the upper corner of the window, but as much as I wipe the window off after I move them outside, they keep coming. They have also made it into both bathrooms on the same floor as the kitchen, but under a handful. It appears to be a type of diabrotica, and these all seem to be from Mexico and south. I am trying to figure out what they are and how to make the house less hospitable so that they will go away and stay away. I have included a photo of one. Thanks for your help.
Often, overwintering insects fly in from miles away. Even if your neighbors have elm trees, getting rid of the trees is very unlikely to stop the problem.