The Mishna here states that on a food that is a Min K'lala, for example, it can cause Hefsid to the crops, you would not make a Brocha, for example, kosher grasshoppers.
But since this is indeed edible, wouldn't this be outweighed by the consideration that eating without the Brocha is like stealing from Hash-m?
Rebbi Yehudah holds that we do not mention the concept of "Berachah" on anything that brings damage or corruption. If we were to recite a Berachah on such a thing, it would appear as if we were disparaging and ridiculing (for Hash-m brought those things into the world primarily to bring punishment, and not for us to obtain pleasure from). Accordingly, it would not be considered Gezeilah from Hash-m not to recite a Berachah, since it is only Gezeilah when there is a Chiyuv to recite a Berachah and one does not recite it, but not where there is no Chiyuv to recite a Berachah at all.
M. Kornfeld