Banning any fruit or vegetable is NOT an option

“Behold, I have given you every seed bearing herb, which is upon the surface of the entire earth, and every tree that has seed bearing fruit; it will be yours for food.”
[Beraishis 1/29]

…I often wonder why our sages never banned any of the many species that Kashrut organizations claim are too “infested” with bugs to be permitted.

The thought came to me today that the answer is simple:

There is a well known rule in Halacha that although the Sages have the authority to forbid things that the Torah never forbade, in order to strengthen Torah law (Rabbinical transgressions) , they do NOT have the authority to forbid things which the Torah EXPLICITLY permits. [Taz Y.D. 117/3]

In the parsha this week, the Torah explicitly permits eating ALL species of fruit and vegetables!

So whereas checking commonly infested species before eating is required, banning an entire species is not an option.