This has got to be one of the top 5 easiest fly patterns of all time. It is super quick, durable, and catches it’s fair share of fish. A true “Guide Fly”.
Caddis larva are available to trout year round. The Green Rock Worm caddis imitation has very few steps, and is a very easy fly pattern to tie. It can be used as a searching nymph, or to match the available food types in a given stream. It is bright and catches the attention of fish, so it can be used effectively as a lead fly in a tandem nymph rig to attract the fish that often will then take the small trailing realistic pattern. However, don’t let that fool you. This pattern represents free-living caddis and takes picky trout on very tough rivers. Here in Utah, Provo River fly fishing guides often tie up and fish this pattern because it is so easy and so effective.
The Lower Provo can be a very tough fishery. As the summer rolls along the fish become more and more educated and the pickier they seem to become. Often times guides switch to drab natural nymphs, and that regularly gets the job done. However, despite being bright and flashy, quite often I have found this green rock worm fly pattern to be the fly of choice. As trout catch onto fishermen and their fly patterns, I have found that my success rate goes up when fishing the smaller sizes 18-20. Go figure!
Take a few minutes and check out this fly tying video. This is a go-to caddis larva fly pattern that belongs in your box. Let us know of your success and FISH ON!
Hook: Dai-Riki 135 (Scud Hook) 14-20
Bead: Gold to match hook size: 14: 7/64″, 16: 3/32″, 18 and 20 5/64″
Thread: Uni 8/0 Olive
Rib: 4X monofilament
Body: Caddis Green Ice Dubbing
Collar: Black Hare’s Ear Dubbing