The real killer is the aminopterin. Did you take a look at hte WIKI link I posted. It's a very toxic drug used here as an anti-cancer drug. It would kill anything long term.
I agree with you and I also believe there is more going on than we know (yet)... it's time people wake up to what is bound to happen if we insist on pushing out the farmers and start importing more and more of our food stuffs. This could be the canary in the coal mine scenario.