Cicadas are a favorite food of fish, so anglers use lures that emulate cicadas. When there is a large emergence aka “hatch” of cicadas, it can drive the fish into a feeding frenzy, which anglers take advantage of.
There’s a new book called Cicada Madness by author Dave Zielinski that focuses on “timing, fishing techniques, and patterns for cracking the code of epic emergences”. The book features images by myself, Roy Troutman, and others. The book is 164 pages long and features 39 pages of fly patterns.