The larvae of the Carrot Rust Fly makes tunnels in carrot roots. I have them here, apparently.
I like the QAL though;it's food for the beautiful Black Swallowtails and it attracts the helpful Ladybug and Lacewing. I do try to deadhead, at least, any that show up in the tended parts of my yard. I'd prefer they stay in the meadow and along the trails instead. They're nearly impossible to dig out of the garden.