Fescue will tolerate Turflon Ester. The SU herbicides, save for halosulfuron and chlorsulfuron, are marginal on cool season grasses. I believe that 1/4 oz per acre is a safe rate on fescue. You read correctly and that is enough to take out many broadleaf weeds. It is that potent.
They who can give up essential liberty to obtain a little temporary safety, deserve neither liberty nor safety.
Benjamin Franklin 1775
Sell not virtue to purchase wealth, nor Liberty to purchase power.
Benjamin Franklin Poor Richard's Almanac1738