Sulphur Dun

The Sulphur Dun Dry Fly, designed as a homage to the Sulphur Mayfly hatches. It's a classic pattern that has its roots in the limestone streams of Pennsylvania. Originally popularized by the 20th-century fly-tying innovator Vince Marinaro, the fly was created to imitate the delicate and vivid appearance of Sulphur mayflies during their emergence phase. Its pale yellow body and translucent hackle wings make it highly effective during the late spring and early summer months when Sulphur hatches dominate many Eastern and Midwestern streams.

Tie the wing just a touch forward of center—this shifts the fly’s balance so it lands upright almost every time and produces the exact front-heavy silhouette of a real sulphur dun struggling to lift off, which triggers far more confident takes.