Dalotia coriaria - Rove BeetleTired of Fungus Gnats? Meet the Beetle That Lives to End Them. This is Dalotia coriaria, also known as the rove beetle. It doesnt just suppress fungus gnatsit hunts them down, flips the soil, and ruins their entire reproductive plan. It works quietly, overnight, and underground. And it works fast. Dalotia coriaria (Rove Beetle) Fast Acting Soil Predator for Fungus Gnats, Shore Flies, and Thrips Pupae You wont see Dalotia oftenbut youll know its there.