The Diawl Bach, often translated from Welsh as “Little Devil,” is one of the most effective and enduring stillwater flies ever created. Despite its simple appearance, this unassuming pattern has a reputation for taking trout when little else will—earning its devilish name through sheer consistency.
Traditionally tied slim and sparse, the Diawl Bach imitates a wide range of natural food forms, from buzzer pupae to small nymphs and general subsurface life. Its strength lies in suggestion rather than exact imitation, making it deadly in clear waters where trout can be selective.
In this video, I tie a leggy variation of the Diawl Bach, adding movement and life with soft, mobile fibres that pulse and breathe in the water. This subtle adaptation gives the fly an extra edge, especially when fish are cruising or feeding just off the bottom.
Whether you're fishing it on a team of flies, under an indicator, or on a slow retrieve, the Diawl Bach remains a must-have in any fly box—a true classic that continues to fool trout across the UK and beyond.
Materials Used;
Hook, Fulling Mill All-Purpose Medium size 12
Thread, Red Uni-8/0
Rib, Fine Copper Wire, Back, Medium or Small Red Holographic Tinsel
Body, Peacock Herl
Legs, Pre-Knotted Pheasant Tail
Eye, Jungle Cock or Goose Biot
Head, Fulling Mill Red Tactical Peace Flash Dub and Small Opal Mirage Tinsel
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