A dead man switch on GMOs, in case there are any other unexpected consequences, has already been mentioned here.

https://news.ycombinator.com/item?id=12015572

And after reviewing that thread again, it appears such technology has already been commercially developed (https://en.wikipedia.org/wiki/Genetic_use_restriction_techno...). Although in this instance it doesn't make the plant susceptible so much as it creates a food system dependency on the company that sells the GMO in order to grow the food in the first place.