A taste of fall weather will be in our area for the rest of the week, and with respect to fishing the South Fork it could signal some changes. One change is the beginning of the fall mayfly emergence cycle meaning the appearance of BWOs and mahogany duns in numbers big enough to interest resident trout. At the same time PMDs and pink alberts will begin a decline in numbers. But until a killing frost wipes out land based bugs, any fly pattern looking like a terrestrial insect will be effective in interesting trout. The other change that will gradually take place is the increased effectiveness in time of streamers in luring larger trout. So consider going to the tying vise to crank out patterns appropriate for fishing during the upcoming change in season.