How to Identify and Control Walnut Husk Flies

Side profile of the walnut husk fly (Rhagoletis completa) on a gray background.

Walnut husk flies are damaging pests, particularly in California and Washington State. The flies pupate in the ground for 1-2 years and spend their larval stage hidden inside the husks. However, by monitoring the adults, you will know when to treat these pests before they lay their eggs. Read on to learn how to control these voracious insects.