Sulphur Dun Dry Fly – Mayfly
Big Y Fly Co. presents the Sulphur Dun Dry Fly, a highly effective imitation of the Ephemerella invaria mayfly, one of the most reliable hatches across the Midwest and beyond.
The duns emerge quickly and are often referred to as the Pale Evening Dun. These hatches typically begin in May and can last for two to three weeks.
| Feature | Detail |
|---|---|
| Species Imitated | Ephemerella invaria |
| Hatch Season | May to early June |
| Flight Duration | 2–3 weeks |
| Common Name | Pale Evening Dun |
FAQ
When is the best time to use the Sulphur Dun Dry Fly?
The Sulphur Dun hatch typically begins in May and lasts for two to three weeks, making it ideal for early to mid-spring fishing.
Is this fly suitable for all types of water?
Yes, it is especially effective in still waters and slow-moving streams where Ephemerella invaria hatches are common across the Midwest and other regions.
How does the Sulphur Dun differ from other mayfly duns?
The Sulphur Dun, also known as the Pale Evening Dun, emerges earlier and more consistently than other dun patterns, with a distinct pale yellow to golden body color that mimics the natural hatch.
Lucas Dyer –
This fly worked perfectly during a May trip on a quiet river. The color matched the natural hatch well and it stayed on the water without sinking. I caught several trout with it.
Jasmine Simpson –
Felt solid and well-made. The pattern is accurate and the wings are thin enough to float naturally. Used it during a two-week stretch in early May and saw good results.
Keith Walker –
Great match for the Pale Evening Dun hatch. I’ve used it in multiple lakes and streams and it consistently attracts fish when the weather turns warm in May.