Re: Entomology App?
Dont know of one but can tell you a pheasant tail nymph and hares ear nymph will cover most mayfly nymphs. Dry flies will be different though. You need to learn from locals, flyshops, fishing reports on what bugs are hatching local to you and go from there. The internet and google are your friend. I'm sure if you give us more info on where you fish someone can help you here