The Grey Duster is a real old school classic. In fact it is credited as the first ever emerger fly. For it to be a Grey Duster and indeed fished as an emerger it must not have a tail. It has a rabbit underfur dubbed body which along with having no tail allows the body to sink below the surface and is suspended by the good quality stiff grizzle cock hackle. It can be difficult to see this fly on the surface in certain light as all thats visible above the surface is the hackle. But takes are unmissable and trout really Hammer this fly whenever they are feeding on emergers . It is important to remember not to put any floatant on the body, just the hackle only as you want the body to sink and just the hackle to float.
The Grey Duster will imitate any emerging upwinged fly. Just use the appropriate size for the species of fly you are trying to imitate depending on the time of year.
Large Dark Olive- March, April and September size 14
Medium Olive- May, June, July and August size 16
Pale Watery- May, June and July size 16
Blue Wing Olive- June, July and August size 18