Above is a helpful video from Tightline Productions and shows a fly pattern that is easy to tie.
I’ve found that small flies with a trailing shuck and some budding wings are really effective. Sometimes just a shuck and a large thorax, such as the WD-40 fly, is enough. Sometimes, a fly that also includes a budding wing, like the one above, is the ticket. Regardless, these are go-to flies.
I tie a variety using various materials and colors. It’s fun to experiment.
And, they work well.