Hatches Made Easy:

Green Sedges (Rhyacophila sp) - Adults


As the name implies, the Green Sedge's body is usually green and its wings are
a gray to brown mottled color. They can have gold specs in them. They are
imitated using a size 14, 16 or 18 hook depending upon the particular species.
Most of them are a size 16. Usually the emerging pupa imitations will outperform
the adult imitations of the hatching caddisflies.
A wet imitation of the adult would work better than a dry fly to take trout
during the egg laying process
. The female dives to bottom to lay her eggs
and then accents to the surface and usually drifts for some distance before
dying or flying away to repeat the process. They also crawl to the bottom on the
surface of rocks and deposit their eggs.  

To imitate the divers, weight the wet imitation of the adult and allow it to sink and
then bring it back to the surface on the swing. You can use a dry adult imitation
to imitate those drifting on the surface after they have laid their eggs but I
question just how effective it will be. Spent wing patterns will also work if they are
presented at the end of riffles in the calmer water where the spent caddisflies
tend to congregate. Because the females crawl or dive to the bottom and are
saturated to some extent, they probably don't stay on the surface very long
when they die.

Again, I wouldn't place too much importance on this hatch. It is difficult to
determine when the pupae are emerging and unless there are a lot of them, it is  
difficult to determine when the females are depositing their eggs. They don't stay
on the surface where you can see them very long. If you do find a good hatch of
them and you do determine that they are emerging, be sure to try imitating the
pupae. If you discover lots of them diving to deposit their eggs, try a wet imitation
of the Green Sedge. The main point I want to make is that
 Imitating the larva
(Rock Worm) is the only technique you can count on.
These larvae are
available for trout to eat much of the time.   

Coming Up Next:
Green Sedge Fly Pattern Colors

Copyright 2008 James Marsh