Carrot flies are a common pest that can damage carrot crops. The carrot fly lays its eggs in the soil near carrot plants, and the larvae hatch and feed on the roots of the carrots. This can cause the carrots to become stunted, deformed, or even inedible. There are a number of things that can be done to avoid carrot fly, including:
Using physical barriers, such as row covers or netting, to prevent the flies from reaching the carrot plants.