Earlier quoted context omitted.
Yes, we all would hate to be that farmer, unfortunately for you that farmer as far as we know does not exist and is a hypothetical. There are as far as I know no pests that exist North of the border that do not exist South of it (though the reverse does occasionally happen). Of course all the good little boys and girls will only eat apples locally grown to make sure such terrible dangers will not befall the local far…
It is more complex than that. It is obvious to you that apples cannot bring any pests. Last time I checked you were an IT professional, not an epidemiologist; so please forgive me if I am skeptical of you abilities to judge whether the assertation up there is true or not. Actually, I am skeptical of the abilities of the average tourist to judge whether the thing they are already biased to do for their own comfort is…
I can take an apple from where I'm sitting to the Turkish border 2000+ km away without anybody batting an eye but somehow miraculously an apple in the possession of a traveler from Canada to the USA or the other way around is a huge danger.
As for me being an IT professional: yes, that's my main occupation. But besides that I have a rather wide interest (as in pretty much anything that I can read that I can get my hands on) and have also lived on the Canadian/US border.
And the thing that I recall is that every so often the USA would come up with some trumped-up reason to declare Canadian products/produce/whatever to be so dangerous that they could not possible cross the border any more, and more often than not (in fact, pretty much all the cases) were simply protectionism under the guise of safety.
Fearmongering in the name of commerce, what else is new?