Except for an occassional green weenie, I have fished nothing but yellow stimulators, yellow caddis, and yellow parachute adams for the last six weeks. I caught 15 bows last Thursday on yellow caddis and yellow adams. I could not get the fish to a green weenie. I am a slow ,lazy fisherman that wanders upstream fishing small pocket water areas. I ran into a kid ( around thirty) last Thursday that was catching Specs up high on Royal Wulffs. I have no real idea what motivates the fish. I just know that stealth and good casts with no false casting is absolutely essential to success.