A woodworm infestation can manifest through several telltale signs. One of the most noticeable indicators is the presence of small, round exit holes in wooden surfaces. These holes are typically where adult wood-boring beetles have emerged from the wood. Another common sign is the appearance of powdery wood dust, known as frass, which accumulates around the exit holes or in the tunnels created by the larvae. Additionally, you might spot adult beetles near the infested area, as they often linger in proximity to where they laid their eggs. If you observe any of these signs, it's essential to take prompt action to address the infestation.