What Happens to Kale When it Hears Itself Being Eaten?

Advances in sensors and communication systems, such as those pinpointing the amount of water and fertilizers needed in just one corner of a plot of land, are allowing farmers to use technology to produce more food. Now there’s a surprising new tool to add to the precision agriculture arsenal: sound.

Source: What Happens to Kale When it Hears Itself Being Eaten?

The fact that plants hear is nothing new, but the idea of using sound to trigger their defense mechanisms is.  While there’s the benefit to agriculture (and subsequently our health), I have to figure that the trade-off will be taste, nutrition, and possibly resources (more defense would mean more water/etc).