The logic behind this is flawed I'm afraid. Most of the GMO cereals in question don't carry the terminator gene in their pollen so the sterilisation of other plants is impossible. For the very few that don't, most GMO cereals have a maximum pollen range of about 60m and an active range of much smaller than that, this is because they're self-pollinators. In reality this means that there is a massive chance that you're going to be pollinated by the plant next to you, regardless of what is further way. What you would get is the occasional pollination from the sterile crop (which produces a sterile seed and you start again it does not sterilise the whole plant) while continual swamping from much closer pollen producing fertile individuals (which actually produce seeds).


Your understanding of agricultural crops is misleading you here. GMO crops aren't suited to run wild away from agricultural areas, they can't compete without ground preparation and you know, farming. GMO's aren't super-crops, they're designed to have very specific roles (provide extra Vitamin A, produce a protein that prevents larval development in a moth larvae that can only survive on monoculture). Most of the time they're not even as hardy as the crops they're replacing in any other medium than the one they're in.


This only requires threat assessment to debunk. Firstly, these herbicides are specific, if it can be produced by a plant to kill a weed it won't be able to kill a similar crop. I'm sure there are blanket herbicides that will kill anything that even dreams of being green but plants can't produce that in their cells. So even if the toxins did reach the non-GMO crops it wouldn't provide anything other than weed protection. Secondly you've got to look at how likely the exposure is, how often are GMO and non-GMO crops planted close enough together that a toxin produced in the cells of a plant could reach? I've frankly never heard of a case where plants have been engineered to produce a toxin other than to stop things feeding on them, the great thing about this is it stays in the plant. Even if they could get a plant to produce a herbicide (god knows why they would which is the main question), the chances of it getting out of the plant in harmful concentrations, never mind to crops outside the farming area is tiny.

The problem with GMO and herbicides isn't that herbicides produced by plants might reach NTO's, it's that herbicide resistant GMO's might cause farmers to go wild and spray herbicides are far more than they need to. This isn't a problem with GMO's, it's a problem with poor farming techniques.