Ah. I see. Wwwwoooosh! Yes. I mispoke. ha!
Well, let it not be said that I don't acknowledge my own stupid mistakes.
Roundup is an Herbicide, which yes, kills plants, not insects. Farmers spray it on their fields so only the plant they want grows, and not all the weeds (which would probably provide cover for the ground and help reduce evaporation, but oh well.)
Despite my Tongue Twisting Error, the stupid WEEDS are becoming resistant to Roundup, because evolution.
We have a similar issue with INSECTS becoming resistant to PESTICIDES.
Both of these scenarios leave us with farmers who can't reuse seed, have to buy expensive seed, and now that the weeds and insects are growing resistant, the expensive chemicals they bought don't work there either. Then there's the environmental effects of spraying herbicide and pesticide all over, which usually runs off into your drinking water, etc.
Sorry I misspoke. My Apologies. Despite my very stupid brain fart, what I am saying is still accurate.