it's more than being resident to a herbicide chemical. The GMO crops need, absolutely require the herbicide chemical as well as conventional fertilizer and growth regulators. Not spraying the herbicide but using all other conventional inputs won't reach reported yields, 15-30% less.
Africa can't afford conventional inputs or substitute organic inputs with or without using herbicide to reach reported yields.
1yr organic corn production for Syngenta. I learned a lot of scary stuff.