Jeffrey Hahn, Asst. Extension Entomologist
All stag beetle larvae feed in dead or decaying wood, such as logs and stumps. Most adults emerge in May or June and feed on sap that exudes from plants. Stag beetles are active at night and are often attracted to lights. They can fly into a yard, land on the ground and remain there until the following morning. Some people have observed stag beetles emerging from the ground. This indicates that there are some old roots or other buried decaying wood where the larvae were feeding and developing.
Although a lot of stag beetles in a yard is annoying, they are harmless to people and property. Do not spray stag beetles, their control isn't necessary. Just ignore them until they go away on their own.