The Stimulator often just called "Stims" is an amazing fly trout pattern. The Stimulator fly was originally developed by Randall Kaufmann to imitate a stonefly adult. But that is not the only insect the Stimulator flies can imitate, it can be seen as a grasshopper, caddis or even large drake mayflies! It is also a great dry fly for fishing a dropper underneath - during summer we see Stimulators with Buzzers suspended below, the Stimulator looks like a caddis or sedge. The bushy profile and deer hair make the Stimulator a highly buoyant fly.
Stimulator Flies Seasonal Usage Guide
Imitate a Stonefly, hatching March to October, plus a Caddis or Sedge which hatches from June to October, this fly is al fly for all seasons.