[john hall]

I don't know where the myth is that Roundup lasts for months. Maybe in retail stores there is a mix of Roundup and something else, one for a burndown and the other for "season long" control. All I know Is I use real Roundup (power max I believe) and I have to come back 2-3 times over the summer to keep weeds and grass at bay. In fields, a crop generally takes over and provides so much competition that a new crop of weeds can't survive. The 2-4-D products I use on fallow land don't have any carryover that I have observed either. I try to alternate away from glyphospate when I can so as not to contribute to herbicide resistance.