The Sulphur Dun Dry Fly is a highly anticipated and essential mayfly pattern for anglers, especially on the rivers of the East and Midwest. The hatch of these pale yellow mayflies (Ephemerella invaria or similar species) signals a major feeding opportunity for trout, particularly during late spring and early summer evenings. This fly perfectly imitates the newly emerged dun (adult stage) sitting upright on the water's surface, a key target for selective trout that are looking for easy meals before the insects take flight. 

Product Features

• Realistic Dun Profile: The upright wing and pale yellow body provide a lifelike silhouette of a Sulphur dun sitting on the water's surface.
• Optimal Coloration: The pale yellow or cream-colored body and wings are an accurate imitation of the natural insect's hue, a critical factor for fooling picky trout.
• Reliable Float: Tied with high-quality hackle and materials, this fly floats high and dry for a perfect presentation in calm to moderately slow-moving water.
• Durable Construction: Expertly tied to remain effective even after multiple fish during long hatch periods.
• Optimal Sizing: Available in the essential size #16, a prime match for many Sulphur hatches. 

When to Use the Sulphur Dun Dry Fly

The Sulphur Dun excels during specific, important hatches where trout are keying in on these pale-colored mayflies. 

• Evening Hatches: This fly is most effective during the late afternoon and evening, when Sulphur mayfly hatches are most prolific.
• Late Spring & Early Summer: This pattern is essential during the major Sulphur hatches that occur during these seasons, often lasting for weeks.
• Clear, Slow-Moving Water: Its realistic, delicate presentation is perfect for clear rivers and streams where fish have ample time to inspect the fly.
• Match-the-Hatch Specifics: Use this pattern when you observe pale yellow or cream-colored mayflies on the water or flying nearby, and trout are rising steadily.