The Alder trout fly is a great fly to have nearby during the early summer when naturals are around. Great fishing fly used any way an angler sees fit.
Alder
Search & Destroy Loaded Fly Box - Ascent Fly Fishing
Why is this pattern so rare? (The Alder dry fly)
Alderfly, Aquatic, Larvae, Nymphs
Alder flies hi-res stock photography and images - Alamy
A pattern from Thomas Ames' Hatch Guide and over the years I have found it to be the most productive pattern for the alder fly hatch.
Alder Fly
Stillwater Alder Larva Nymph - 1 Dozen – Glasgow Angling Centre
Alder Wet Fly, Discount Trout Flies, Wet Flies for Fly Fishing –
Podell's Alder Fly - Fishing Flies with Fish4Flies Worldwide
March Brown - Ascent Fly Fishing