RR corn works OK for most folks. However, we with Giant Ragweed end up with what you see in the pictures below. I can kill what is there, but i have trouble with the ones that come to the funeral. Johnsongrass is a similar problem. If you spray rhizome Johnsongrass this time of year, come August you will find a ring of new growth around where the dead plant was.
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Here is one of my problems with RR corn and beans
