The September fly of the month is from PRO-Team member Paul Procter, it's the Pearly Butt Fly.

Generally, when upwing flies are present a “go to” of mine is a Shuttlecock of sorts (Apr FOTM).  Whilst this serves me well, in the case of refusals or trout steadfastly turning their noses up at such, calls for an alternative.  Like many, I’ve long been a fan of the F Fly though these days tend to deviate from the original by using a curved hook and inclusion of pearly tinsel.

Obviously a hook cranked downwards is going to suggest a partially emerged nymph/adult which fish have a canny habit of singling out. With its long, sharp point and gently curve the K4AY is fit for purpose here.  Furthermore, suggesting a partially vacated shuck a pearly backside adds an authentic seal of approval.  Thinking their meal isn’t about to disappear in a blur of wings then, trout and grayling for that matter are hopefully fooled into thinking this is a sitter.

Whilst I’m not overly precious about a specific brand of dubbing, it’s crucial to select one fine in fibre (Superfine here).  This binds down much tighter to form a neat, yet compact body that easily penetrates the surface film, allowing your fly to sit correctly the moment it alights.  Many beginners fall foul of incorporating more wiry/prickly dubbings here, which have a nasty habit of exploding into an unruly mess, rendering the best part of your fly unsinkable…

As for the CdC, two plumes are about right on size 14-18 hooks.  Though rather than being secured immediately behind the eye the wing is set back a fraction further back, before a wisp of pine squirrel dubbing is added in front.  After all the wings on a natural fly protrude from the rear of their thorax and not the head!

Pearly Butt F Fly

Hook: Partridge K4AY size 12-16

Thread: 14/0 primrose Sheer

Butt: Fine pearly tinsel

Abdomen: Fine dubbing (B-WO Superfine shade here)

Wing: Natural CdC

Thorax: Pine squirrel and rusty spinner Superfine dubbing