Originally Posted by Smallplot
Welka what broadleaf were not controlled by the Butyrac (Some species are not listed on the label)? Did you use a crop oil with it (Most broadleaf weeds have a waxy coating that must be penetrated by herbicide)? Were the weeds actively growing when you sprayed them (If sprayed during extremely hot weather or extended dry conditions, many weeds will quit growing, going into a dormant state)? Just food for thought!
I have to concur with Smallplot on this on. I have used 2, 4, D-B (Butyrac 200 & Butoxone) for many years and they successfully kill and clean out just about every problematic broadleaf weed(with the exception of Thistle) in a clover plot. And, it will knock Thistle silly if the plant is young enough.
I would also add that conditions have to be really good and plants have to be actively pulling moisture from the soil in order to work. And without questioning your capabilities I will also add that an improper calibrated spray rig is the culprit 99% of the time when failures occur.