The March Brown Deer Hair Emerger is a simple but very effective trout pattern I have been fishing for many years to imitate the larger mayflies that emerge in spring on southern freestone streams. It's comprised of three materials, and by changing them up in different colors and sizes, you can imitate a number of mayflies with ease. The pattern floats well and is effective on both fast and slow waters, which is a plus, too.
Hook: TMC R200 #10
Thread: 6/0 Danville Orange
Trailing Shuck: Mayfly brown micro zelon
Body: Fawn rabbit
Wing: Deer body hair