FALL OLIVES
Trout tend to find areas of slower currents or edges of riffles where hordes of duns and emergers collect.
It's your ability to spot a hatch and know this trout tendency, to then be in proper casting position that will bring success. Work the same seam as the fish to eliminate drag.
Blue winged-olive duns are generally larger in the spring than the fall hatch. This can be attributed to a separate species being present in the fall. Baetis range in size from #16 to #20; Pseudocloeon ranging from #20-26.
"Blue-winged olive" is a common name that applies to more than a single mayfly species. The common name applied to the fall hatch is, more appropriately, the tiny western olive.