What is the adult form of the billbug?

The adult form of the billbug is indeed referred to as the adult. Billbugs are a type of weevil, belonging to the family Scolytidae, and they undergo complete metamorphosis, which includes four life stages: egg, larva, pupa, and adult. The adult stage is characterized by its hard outer body, a distinctive elongated snout, and robust antennae. At this point, the billbug is capable of reproduction and plays a significant role in the pest lifecycle, particularly in how it affects turf and other grasses. Understanding the full life cycle of pests like the billbug is crucial for effective pest management in turf systems. Other life stages such as larvae, grubs, and pupae are intermediary forms that eventually develop into the adult, but they do not represent the stage you are identifying.