Years ago when roundup grains were developed weed killing was made simple.
Throw some roundup in the spray tank and kill every weed out there without killing the crop.
So simple some thought if 32 oz will kill the weeds lets try 24. That may have worked as well.
Some guys backed down even farther and a few weeds escaped. These weeds were some what resistant to the glysophate. Their offspring were even more resistant.
As of right now I have no resistant weeds that I know of. I use full rates of glysophate and adjuvants when I spray and always have.
I have 2 neighbors that tried to get by on the cheap path 6 or 8 years ago by lowering the glysophate rates and no adjuvants. They had a few escape weeds but thought nothing of it.
Fast forward to today. They have weeds that they cannot kill with glysophate no matter the rate and have to use more expensive chemicals to kill them.
All the neighbors around them still have control including me but the 2 who skimped have issues.
On a related note: I have CML. I have been in remission for 8 years but still take a daily dose of Chemotherapy. I asked my doctor why?
He responded if there are any CML cells in your system and you go off the meds chances are they are resistant to the medication and we may not be able to get them back under control.
Some thing to think about.
Just my view.