What the trout will take depends upon time of year, conditions (wind direction and strength, water temperature, light-levels, turbidity etc), and what insect life is doing what (and each lake will have a different population of insects and conditions).
Successful patterns used in the morning will have you blanking after lunch.
A popular lure that catches 80% of the time is no use at all if the fish have switched over to feeding on some obscure nymph for an hour or so.
A fly box should contain not just a few favourites, but flies that cover all possible combinations (and sometimes even the same fly pattern doesn't work unless it is the right colour and size, let alone worked at the speed and depth and distance that the trout are demanding on the day).
Having stuffed fly-boxes with hundreds of different flies, now is the time to become really confused selecting a likely pattern and matching it to line-weight and rod length and action etc to get the most out of it.
Of course it would be far easier to dangle a worm, but where's the fun in that
top 5 flies for Trout in Lake
...pip pip
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