The fall, with its cooling temperatures, is probably one of the most effective times to fish flies which imitate bees and wasps. Many of these bees and wasps fly, or fall into lakes and streams to be eaten by hungry trout. The floating bee is the sleeper terrestrial right now. Fish that have seen lots of beetles and crickets and have grown a bit wary of them (especially on calm days) are usually suckers for a bee imitation. Fish respond to new and different flies, and this is a classic example. This foam fly will take trout in late summer when they won't even look at a hopper any more.