What is the primary pest affecting walnuts known as Rhagoletis completa?

The primary pest affecting walnuts that is identified as Rhagoletis completa is indeed the Walnut Husk Fly. This pest is a significant concern for walnut growers because its larvae feed on the husks and developing walnuts, leading to reduced quality and yield. The adult flies are typically dark-colored and can be recognized by their distinct wing pattern. They lay eggs in the husk of the walnut, and once the larvae hatch, they burrow into the walnut, which can cause damage that allows for secondary infections or spoilage. Understanding this pest is crucial for effective management and control strategies in walnut production, ensuring the health of the crop and maximizing yield.

Other options listed refer to different pests or plant diseases affecting walnuts or other crops, but none are classified under Rhagoletis completa. For instance, Walnut Thrips are small insects that can affect the foliage but do not have the same impact as the Walnut Husk Fly on the actual nuts. Crown Gall is a bacterial disease that causes tumors on plants and does not pertain to the walnut pest category. The Codling Moth primarily affects apples and pears, rather than walnuts, making the Walnut Husk Fly the correct identification for Rhagoletis completa.