The Blue Winged Olive, more famously referred to as a BWO, is a must have pattern for every dry fly box. Traditionally being the most effective in June in Ontario, but always keep an eye out for this hatch in the warmer months. You should have these in sizes 16, 18, and 20.
HOOK: Size 16 dry fly hook
THREAD: Nano silk in colour dun
TAIL: Mayfly tail fibers in dun
ABDOMEN: Olive turkey biot
THORAX: Superfine dry fly dub in colour BWO
WINGS: CDC in grey and white